Music loses sound sometimes on Bluetooth.

I'm using sennheiser momentum 4 Bluetooth headphones and every now and then the song will just become muted. I'm using an android phone. It will still play the song as the song still shows the minutes and time slider going up but I get no sound unless I play another song. I'm not sure why this happens. Does this happen to anyone else. Does anyone know of a fix? The way I've been resolving it so far is just to pick another song and then switch back to the previous song.