No wonder samsung gave them away, the left bud constantly breaks up & goes out of sync with the right, I've tried everything to rectify this but nothing works, samsung you have produced a very disappointing product.
I have the same problem. Its not always the left though. It's never a problem with just 1 in, left or right. I dont mind 1 ear for listening to podcasts or YouTube, but its basically impossible to listen to music with these.