There is something wrong action on RPI3 with MATE 16.04.
If I control the volume to change value frequently, the audio doesn't work properly.
I mean the audio is sometimes mute or don't play smoothly.
I'll test with gstreamer, vlc, browser and aplay but there is same problem to play with it.
There is the test sequence as belows:
1. download sample audio. (http://file-examples.com/wp-content/uploads/2017/11/file_example_WAV_5MG.wav)
2. play it.
or vlc file_example_WAV_5MG.wav
or gst-launch-1.0 playbin uri=file:///home/pi/file_example_WAV_5MG.wav
3. frequently change volume using desktop tray icon.
There is no issue with Raspbian OS but unfortunately I can't use it because there is another issue with Raspbian OS.
Please let me advice this issue.