i had the this problem also, but i had no sound at all, maby this is can fix your phone to. the first thing to to is to clean the uotput jack with some electronics cleaner and check that there is no clogging in the bottom. I notised on my s3 that the screws underneath the plastic cover had become loose. this resulting in a poor connection or something not being in the right place. i tightened the screws with a tiny Phillips screwdriver and the problem was solved.