gs3 sound from only one headphone

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http://forums.androidcentral.com – got an s3 in jan and it has it has worked perfectly until today when i plugged in my headphones i could only get sound from one cup i changed headphones same problem and i tried the headphones with other devices they were fine is there anything i can do sound from only the left headphone same with earphones the problem can be rectified by pushing the connecting jack down and to the left or pointi ng it a certain way but it goes back to one earphone if you leave it and so i want a more permanent fix if i can get one (HowTos)