Resolved issue that was causing audio to cycle between stereo channels

when audio decoding is sporadic/intermittent.

src/audio/output/MonoAudioOutput.java

@@ -165,6 +165,8 @@ public class MonoAudioOutput extends AudioOutput
 								checkStart();
 								
 								broadcast( packet.getAudioMetadata() );
+
+								mLastActivity = System.currentTimeMillis();
 							}
 						}
 					}