I think your headphones have a break in the cable somewhere as a break can cause this issue
It could be a board level issue but it’s very very rare and cable issues are much more common that them
Here’s a video on how to replace the cable
this video show you how to replace the headband
Once you have your new cable for the inside you will have to swap the cables out (new one being used)and reassemble normally
Just as a heads up it will require soldering but it’s not too hard:-)
If you need any help along the way please do not hesitate to ask
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