diff --git a/src/app/collection-page/edit-collection-page/collection-source/collection-source.component.html b/src/app/collection-page/edit-collection-page/collection-source/collection-source.component.html
index b0c155ac957..1fe121e8988 100644
--- a/src/app/collection-page/edit-collection-page/collection-source/collection-source.component.html
+++ b/src/app/collection-page/edit-collection-page/collection-source/collection-source.component.html
@@ -1,18 +1,18 @@
 <div class="container-fluid">
     <div class="d-inline-block float-right space-children-mr">
-        <button class=" btn btn-danger" *ngIf="!(isReinstatable() | async)"
-                [disabled]="!(hasChanges() | async)"
+        <button class=" btn btn-danger" *ngIf="(isReinstatable$ | async) !== true"
+                [disabled]="(hasChanges$ | async) !== true"
                 (click)="discard()"><i
                 class="fas fa-times"></i>
             <span class="d-none d-sm-inline">&nbsp;{{"item.edit.metadata.discard-button" | translate}}</span>
         </button>
-        <button class="btn btn-warning" *ngIf="isReinstatable() | async"
+        <button class="btn btn-warning" *ngIf="isReinstatable$ | async"
                 (click)="reinstate()"><i
                 class="fas fa-undo-alt"></i>
             <span class="d-none d-sm-inline">&nbsp;{{"item.edit.metadata.reinstate-button" | translate}}</span>
         </button>
         <button class="btn btn-primary"
-                [disabled]="!(hasChanges() | async) || !isValid() || (initialHarvestType === harvestTypeNone && contentSource.harvestType === initialHarvestType)"
+                [disabled]="(hasChanges$ | async) !== true || !isValid() || (initialHarvestType === harvestTypeNone && contentSource.harvestType === initialHarvestType)"
                 (click)="onSubmit()"><i
                 class="fas fa-save"></i>
             <span class="d-none d-sm-inline">&nbsp;{{"item.edit.metadata.save-button" | translate}}</span>
@@ -44,19 +44,19 @@ <h3 *ngIf="contentSource && (contentSource?.harvestType !== harvestTypeNone)">{{
     <div class="row">
         <div class="col-12">
             <div class="d-inline-block float-right ml-1 space-children-mr">
-                <button class=" btn btn-danger" *ngIf="!(isReinstatable() | async)"
-                        [disabled]="!(hasChanges() | async)"
+                <button class=" btn btn-danger" *ngIf="(isReinstatable$ | async) !== true"
+                        [disabled]="(hasChanges$ | async) !== true"
                         (click)="discard()"><i
                         class="fas fa-times"></i>
                     <span class="d-none d-sm-inline">&nbsp;{{"item.edit.metadata.discard-button" | translate}}</span>
                 </button>
-                <button class="btn btn-warning" *ngIf="isReinstatable() | async"
+                <button class="btn btn-warning" *ngIf="isReinstatable$ | async"
                         (click)="reinstate()"><i
                         class="fas fa-undo-alt"></i>
                     <span class="d-none d-sm-inline">&nbsp;{{"item.edit.metadata.reinstate-button" | translate}}</span>
                 </button>
                 <button class="btn btn-primary"
-                        [disabled]="!(hasChanges() | async) || !isValid() || (initialHarvestType === harvestTypeNone && contentSource.harvestType === initialHarvestType)"
+                        [disabled]="(hasChanges$ | async) !== true || !isValid() || (initialHarvestType === harvestTypeNone && contentSource.harvestType === initialHarvestType)"
                         (click)="onSubmit()"><i
                         class="fas fa-save"></i>
                     <span class="d-none d-sm-inline">&nbsp;{{"item.edit.metadata.save-button" | translate}}</span>
@@ -66,7 +66,7 @@ <h3 *ngIf="contentSource && (contentSource?.harvestType !== harvestTypeNone)">{{
     </div>
 </div>
 <ds-collection-source-controls
-        [isEnabled]="!(hasChanges()|async)"
+        [isEnabled]="(hasChanges$ | async) !== true"
         [shouldShow]="contentSource?.harvestType !== harvestTypeNone"
         [collection]="(collectionRD$ |async)?.payload"
 >
diff --git a/src/app/collection-page/edit-collection-page/collection-source/collection-source.component.ts b/src/app/collection-page/edit-collection-page/collection-source/collection-source.component.ts
index 2d1308cc83a..95295386c0e 100644
--- a/src/app/collection-page/edit-collection-page/collection-source/collection-source.component.ts
+++ b/src/app/collection-page/edit-collection-page/collection-source/collection-source.component.ts
@@ -204,11 +204,6 @@ export class CollectionSourceComponent extends AbstractTrackableComponent implem
    */
   formGroup: UntypedFormGroup;
 
-  /**
-   * Subscription to update the current form
-   */
-  updateSub: Subscription;
-
   /**
    * The content harvesting type used when harvesting is disabled
    */
@@ -228,28 +223,29 @@ export class CollectionSourceComponent extends AbstractTrackableComponent implem
    */
   displayedNotifications: INotification[] = [];
 
-  public constructor(public objectUpdatesService: ObjectUpdatesService,
-                     public notificationsService: NotificationsService,
-                     protected location: Location,
-                     protected formService: DynamicFormService,
-                     protected translate: TranslateService,
-                     protected route: ActivatedRoute,
-                     protected router: Router,
-                     protected collectionService: CollectionDataService,
-                     protected requestService: RequestService) {
-    super(objectUpdatesService, notificationsService, translate);
+  subs: Subscription[] = [];
+
+  public constructor(
+    public objectUpdatesService: ObjectUpdatesService,
+    public notificationsService: NotificationsService,
+    public translateService: TranslateService,
+    public router: Router,
+    protected location: Location,
+    protected formService: DynamicFormService,
+    protected route: ActivatedRoute,
+    protected collectionService: CollectionDataService,
+    protected requestService: RequestService,
+  ) {
+    super(objectUpdatesService, notificationsService, translateService, router);
   }
 
   /**
    * Initialize properties to setup the Field Update and Form
    */
   ngOnInit(): void {
+    super.ngOnInit();
     this.notificationsPrefix = 'collection.edit.tabs.source.notifications.';
     this.discardTimeOut = environment.collection.edit.undoTimeout;
-    this.url = this.router.url;
-    if (this.url.indexOf('?') > 0) {
-      this.url = this.url.substr(0, this.url.indexOf('?'));
-    }
     this.formGroup = this.formService.createFormGroup(this.formModel);
     this.collectionRD$ = this.route.parent.data.pipe(first(), map((data) => data.dso));
 
@@ -263,10 +259,9 @@ export class CollectionSourceComponent extends AbstractTrackableComponent implem
     });
 
     this.updateFieldTranslations();
-    this.translate.onLangChange
-      .subscribe(() => {
-        this.updateFieldTranslations();
-      });
+    this.subs.push(this.translateService.onLangChange.subscribe(() => {
+      this.updateFieldTranslations();
+    }));
   }
 
   /**
@@ -281,7 +276,7 @@ export class CollectionSourceComponent extends AbstractTrackableComponent implem
     this.update$ = this.objectUpdatesService.getFieldUpdates(this.url, [initialContentSource]).pipe(
       map((updates: FieldUpdates) => updates[initialContentSource.uuid])
     );
-    this.updateSub = this.update$.subscribe((update: FieldUpdate) => {
+    this.subs.push(this.update$.subscribe((update: FieldUpdate) => {
       if (update) {
         const field = update.field as ContentSource;
         let configId;
@@ -308,7 +303,7 @@ export class CollectionSourceComponent extends AbstractTrackableComponent implem
         }
         this.contentSource.metadataConfigId = configId;
       }
-    });
+    }));
   }
 
   /**
@@ -342,18 +337,18 @@ export class CollectionSourceComponent extends AbstractTrackableComponent implem
    * @param fieldModel
    */
   private updateFieldTranslation(fieldModel: DynamicFormControlModel) {
-    fieldModel.label = this.translate.instant(this.LABEL_KEY_PREFIX + fieldModel.id);
+    fieldModel.label = this.translateService.instant(this.LABEL_KEY_PREFIX + fieldModel.id);
     if (isNotEmpty(fieldModel.validators)) {
       fieldModel.errorMessages = {};
       Object.keys(fieldModel.validators).forEach((key) => {
-        fieldModel.errorMessages[key] = this.translate.instant(this.ERROR_KEY_PREFIX + fieldModel.id + '.' + key);
+        fieldModel.errorMessages[key] = this.translateService.instant(this.ERROR_KEY_PREFIX + fieldModel.id + '.' + key);
       });
     }
     if (fieldModel instanceof DynamicOptionControlModel) {
       if (isNotEmpty(fieldModel.options)) {
         fieldModel.options.forEach((option) => {
           if (hasNoValue(option.label)) {
-            option.label = this.translate.instant(this.OPTIONS_KEY_PREFIX + fieldModel.id + '.' + option.value);
+            option.label = this.translateService.instant(this.OPTIONS_KEY_PREFIX + fieldModel.id + '.' + option.value);
           }
         });
       }
@@ -470,8 +465,6 @@ export class CollectionSourceComponent extends AbstractTrackableComponent implem
    * Make sure open subscriptions are closed
    */
   ngOnDestroy(): void {
-    if (this.updateSub) {
-      this.updateSub.unsubscribe();
-    }
+    this.subs.forEach((sub: Subscription) => sub.unsubscribe());
   }
 }
diff --git a/src/app/item-page/edit-item-page/abstract-item-update/abstract-item-update.component.ts b/src/app/item-page/edit-item-page/abstract-item-update/abstract-item-update.component.ts
index 964405dfdda..4c737978142 100644
--- a/src/app/item-page/edit-item-page/abstract-item-update/abstract-item-update.component.ts
+++ b/src/app/item-page/edit-item-page/abstract-item-update/abstract-item-update.component.ts
@@ -35,10 +35,6 @@ export class AbstractItemUpdateComponent extends AbstractTrackableComponent impl
    */
   updates$: Observable<FieldUpdates>;
 
-  hasChanges$: Observable<boolean>;
-
-  isReinstatable$: Observable<boolean>;
-
   /**
    * Route to the item's page
    */
@@ -58,7 +54,7 @@ export class AbstractItemUpdateComponent extends AbstractTrackableComponent impl
     public translateService: TranslateService,
     public route: ActivatedRoute
   ) {
-    super(objectUpdatesService, notificationsService, translateService);
+    super(objectUpdatesService, notificationsService, translateService, router);
   }
 
   /**
@@ -83,11 +79,9 @@ export class AbstractItemUpdateComponent extends AbstractTrackableComponent impl
         this.setItem(rd.payload);
       });
     }
+    super.ngOnInit();
 
     this.discardTimeOut = environment.item.edit.undoTimeout;
-    this.url = this.router.url.split('?')[0];
-    this.hasChanges$ = this.hasChanges();
-    this.isReinstatable$ = this.isReinstatable();
     this.hasChanges().pipe(first()).subscribe((hasChanges) => {
       if (!hasChanges) {
         this.initializeOriginalFields();
diff --git a/src/app/item-page/edit-item-page/item-bitstreams/item-bitstreams.component.ts b/src/app/item-page/edit-item-page/item-bitstreams/item-bitstreams.component.ts
index ee53bd919c2..a9aad655e96 100644
--- a/src/app/item-page/edit-item-page/item-bitstreams/item-bitstreams.component.ts
+++ b/src/app/item-page/edit-item-page/item-bitstreams/item-bitstreams.component.ts
@@ -1,7 +1,7 @@
 import { ChangeDetectorRef, Component, NgZone, OnDestroy } from '@angular/core';
 import { AbstractItemUpdateComponent } from '../abstract-item-update/abstract-item-update.component';
 import { filter, map, switchMap, take } from 'rxjs/operators';
-import { Observable, Subscription, zip as observableZip } from 'rxjs';
+import { Observable, Subscription, zip as observableZip, combineLatest } from 'rxjs';
 import { ItemDataService } from '../../../core/data/item-data.service';
 import { ObjectUpdatesService } from '../../../core/data/object-updates/object-updates.service';
 import { ActivatedRoute, Router } from '@angular/router';
@@ -222,7 +222,7 @@ export class ItemBitstreamsComponent extends AbstractItemUpdateComponent impleme
    */
   isReinstatable(): Observable<boolean> {
     return this.bundles$.pipe(
-      switchMap((bundles: Bundle[]) => observableZip(...bundles.map((bundle: Bundle) => this.objectUpdatesService.isReinstatable(bundle.self)))),
+      switchMap((bundles: Bundle[]) => combineLatest(bundles.map((bundle: Bundle) => this.objectUpdatesService.isReinstatable(bundle.self)))),
       map((reinstatable: boolean[]) => reinstatable.includes(true))
     );
   }
@@ -232,7 +232,7 @@ export class ItemBitstreamsComponent extends AbstractItemUpdateComponent impleme
    */
   hasChanges(): Observable<boolean> {
     return this.bundles$.pipe(
-      switchMap((bundles: Bundle[]) => observableZip(...bundles.map((bundle: Bundle) => this.objectUpdatesService.hasUpdates(bundle.self)))),
+      switchMap((bundles: Bundle[]) => combineLatest(bundles.map((bundle: Bundle) => this.objectUpdatesService.hasUpdates(bundle.self)))),
       map((hasChanges: boolean[]) => hasChanges.includes(true))
     );
   }
diff --git a/src/app/shared/trackable/abstract-trackable.component.spec.ts b/src/app/shared/trackable/abstract-trackable.component.spec.ts
index c538f074c54..ad2d821ada3 100644
--- a/src/app/shared/trackable/abstract-trackable.component.spec.ts
+++ b/src/app/shared/trackable/abstract-trackable.component.spec.ts
@@ -9,6 +9,8 @@ import { NotificationsService } from '../notifications/notifications.service';
 import { NO_ERRORS_SCHEMA } from '@angular/core';
 import { TestScheduler } from 'rxjs/testing';
 import { getTestScheduler } from 'jasmine-marbles';
+import { RouterStub } from '../testing/router.stub';
+import { Router } from '@angular/router';
 
 describe('AbstractTrackableComponent', () => {
   let comp: AbstractTrackableComponent;
@@ -27,6 +29,7 @@ describe('AbstractTrackableComponent', () => {
       success: successNotification
     }
   );
+  let router: RouterStub;
 
   const url = 'http://test-url.com/test-url';
 
@@ -42,6 +45,8 @@ describe('AbstractTrackableComponent', () => {
         isValidPage: observableOf(true)
       }
     );
+    router = new RouterStub();
+    router.url = url;
 
     scheduler = getTestScheduler();
 
@@ -51,6 +56,7 @@ describe('AbstractTrackableComponent', () => {
       providers: [
         { provide: ObjectUpdatesService, useValue: objectUpdatesService },
         { provide: NotificationsService, useValue: notificationsService },
+        { provide: Router, useValue: router },
       ], schemas: [
         NO_ERRORS_SCHEMA
       ]
@@ -60,7 +66,6 @@ describe('AbstractTrackableComponent', () => {
   beforeEach(() => {
     fixture = TestBed.createComponent(AbstractTrackableComponent);
     comp = fixture.componentInstance;
-    comp.url = url;
 
     fixture.detectChanges();
   });
diff --git a/src/app/shared/trackable/abstract-trackable.component.ts b/src/app/shared/trackable/abstract-trackable.component.ts
index e1a99d90b94..396d7438551 100644
--- a/src/app/shared/trackable/abstract-trackable.component.ts
+++ b/src/app/shared/trackable/abstract-trackable.component.ts
@@ -2,7 +2,8 @@ import { ObjectUpdatesService } from '../../core/data/object-updates/object-upda
 import { NotificationsService } from '../notifications/notifications.service';
 import { TranslateService } from '@ngx-translate/core';
 import { Observable } from 'rxjs';
-import { Component } from '@angular/core';
+import { Component, OnInit } from '@angular/core';
+import { Router } from '@angular/router';
 
 /**
  * Abstract Component that is able to track changes made in the inheriting component using the ObjectUpdateService
@@ -11,7 +12,7 @@ import { Component } from '@angular/core';
   selector: 'ds-abstract-trackable',
   template: ''
 })
-export class AbstractTrackableComponent {
+export class AbstractTrackableComponent implements OnInit {
 
   /**
    * The time span for being able to undo discarding changes
@@ -21,14 +22,25 @@ export class AbstractTrackableComponent {
   public url: string;
   public notificationsPrefix = 'static-pages.form.notification';
 
+  hasChanges$: Observable<boolean>;
+
+  isReinstatable$: Observable<boolean>;
+
   constructor(
     public objectUpdatesService: ObjectUpdatesService,
     public notificationsService: NotificationsService,
     public translateService: TranslateService,
+    public router: Router,
   ) {
 
   }
 
+  ngOnInit(): void {
+    this.url = this.router.url.split('?')[0];
+    this.hasChanges$ = this.hasChanges();
+    this.isReinstatable$ = this.isReinstatable();
+  }
+
   /**
    * Request the object updates service to discard all current changes to this item
    * Shows a notification to remind the user that they can undo this