problem with the headphone socket or sound

Has anyone has problem when listening to music using the socket built into the main unit, sometimes whiles listening to music, the sounds seem to move to the left with the left side being louder, not sure if it's the socket or the some problem with the sound chip, but moving the plug of the headset is not the cause of the problem, but you need to pull the plug out and insert back in to get the sound normal.

sometimes just pluging the headphones in also cause the problem.

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