Not had an issue with that, though knew there where syncing issues with Youtube etc, but I was never going to use it for that. Have you ran all the updates? The app isnt good an notifying you if there is one.Yeah they have a good sound, and although I agree they hurt the ear if you dont position them right, most of the time they are comfy.
Only issue I have is that I've had to change music apps as Poweramp keeps popping/cracking during playback. The other app(s) I use dont