diff --git a/lib/media/streaming_engine.js b/lib/media/streaming_engine.js
index a319f5bf79..e2b2e8df06 100644
--- a/lib/media/streaming_engine.js
+++ b/lib/media/streaming_engine.js
@@ -679,7 +679,7 @@ shaka.media.StreamingEngine = class {
 
   /**
    * Clear the buffer for a given stream.  Unlike clearBuffer_, this will handle
-   * cases where a MediaState is performing an update.  After this runs, every
+   * cases where a MediaState is performing an update.  After this runs, the
    * MediaState will have a pending update.
    * @param {!shaka.media.StreamingEngine.MediaState_} mediaState
    * @private
@@ -793,9 +793,9 @@ shaka.media.StreamingEngine = class {
     for (const type of streamsByType.keys()) {
       const stream = streamsByType.get(type);
       if (!this.mediaStates_.has(type)) {
-        const state = this.createMediaState_(stream);
-        this.mediaStates_.set(type, state);
-        this.scheduleUpdate_(state, 0);
+        const mediaState = this.createMediaState_(stream);
+        this.mediaStates_.set(type, mediaState);
+        this.scheduleUpdate_(mediaState, 0);
       }
     }
   }
@@ -907,7 +907,7 @@ shaka.media.StreamingEngine = class {
               'mediastate.stream should not have segmentIndex yet.');
           thisStream.closeSegmentIndex();
         }
-        if (mediaState.updateTimer == null) {
+        if (!mediaState.performingUpdate && !mediaState.updateTimer) {
           this.scheduleUpdate_(mediaState, 0);
         }
         return;
@@ -1392,7 +1392,7 @@ shaka.media.StreamingEngine = class {
         // If the network slows down, abort the current fetch request and start
         // a new one, and ignore the error message.
         mediaState.performingUpdate = false;
-        mediaState.updateTimer = null;
+        this.cancelUpdate_(mediaState);
         this.scheduleUpdate_(mediaState, 0);
       } else if (mediaState.type == ContentType.TEXT &&
           this.config_.ignoreTextStreamFailures) {
@@ -1465,7 +1465,10 @@ shaka.media.StreamingEngine = class {
 
     for (const mediaState of this.mediaStates_.values()) {
       const logPrefix = shaka.media.StreamingEngine.logPrefix_(mediaState);
-      if (mediaState.hasError) {
+      // Only schedule an update if it has an error, but it's not mid-update
+      // and there is not already an update scheduled.
+      if (mediaState.hasError && !mediaState.performingUpdate &&
+          !mediaState.updateTimer) {
         shaka.log.info(logPrefix, 'Retrying after failure...');
         mediaState.hasError = false;
         this.scheduleUpdate_(mediaState, delaySeconds);
@@ -2088,7 +2091,11 @@ shaka.media.StreamingEngine = class {
     shaka.log.debug(logPrefix, 'cleared buffer');
     mediaState.clearingBuffer = false;
     mediaState.endOfStream = false;
-    this.scheduleUpdate_(mediaState, 0);
+    // Since the clear operation was async, check to make sure we're not doing
+    // another update and we don't have one scheduled yet.
+    if (!mediaState.performingUpdate && !mediaState.updateTimer) {
+      this.scheduleUpdate_(mediaState, 0);
+    }
   }