diff --git a/src/dash-playlist-loader.js b/src/dash-playlist-loader.js
index de312e7b5..cf37b53db 100644
--- a/src/dash-playlist-loader.js
+++ b/src/dash-playlist-loader.js
@@ -25,6 +25,21 @@ import logger from './util/logger';
 const { EventTarget, mergeOptions } = videojs;
 
 const dashPlaylistUnchanged = function(a, b) {
+  // derive media sequence for timeshift manifests without startNumber attribute
+  if (
+    b.mediaSequence === 1 &&
+    b.mediaSequence <= a.mediaSequence &&
+    a.segments &&
+    b.segments &&
+    a.segments.length &&
+    b.segments.length
+  ) {
+    const seqDelta = a.segments.findIndex((s) => s.uri === b.segments[0].uri);
+
+    b.mediaSequence =
+      a.mediaSequence + (seqDelta === -1 ? a.segments.length : seqDelta);
+  }
+
   if (!isPlaylistUnchanged(a, b)) {
     return false;
   }
diff --git a/src/media-groups.js b/src/media-groups.js
index c2da756a9..523a8bcdb 100644
--- a/src/media-groups.js
+++ b/src/media-groups.js
@@ -73,6 +73,7 @@ export const startLoaders = (playlistLoader, mediaType) => {
  */
 export const onGroupChanged = (type, settings) => () => {
   const {
+    sourceType,
     segmentLoaders: {
       [type]: segmentLoader,
       main: mainSegmentLoader
@@ -92,7 +93,10 @@ export const onGroupChanged = (type, settings) => () => {
   mediaType.lastGroup_ = activeGroup;
   mediaType.lastTrack_ = activeTrack;
 
-  stopLoaders(segmentLoader, mediaType);
+  if (sourceType !== 'dash') {
+    // only one playlist for dash. do not stop.
+    stopLoaders(segmentLoader, mediaType);
+  }
 
   if (!activeGroup || activeGroup.isMasterPlaylist) {
     // there is no group active or active group is a main playlist and won't change