i had that problem but not with the USB port but the 3mm audio jack port. The problem is the port itself, inside the port there are tiny metal wires that receive the signal from the usb or audio jack
and if they get pushed and pulled in too much they stay in that position and it wont touch one side of the usb stick or audio jack.
i got a pin and pulled it out alittle and made it stay there so now all speaker works.
( please excue my dodgey explaination )
ive done that too it did nothing. so i was playing with my audio jack and trying to see why and i realised the wire was only touching one side of the audio jack.




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