On my trusty FF400 suddenly the headphone out has become dodgy. The left channel keeps breaking away, if i fiddle a bit with the plug of my headphone it comes back but i cant really move my head when ive got stereo otherwise im back to mono again... The headphone works perfectly on other devices, and my other headphone seems to act the same...

Any easy solutions to this or is this straight back to the repairman? I fear the answer