Sound works only on left side.

Hello, there is a problem with my Razer Kraken headset. 2 years ago when I bought a new PC, I also bought a Razer Kraken V2 PRO headset and it worked fine without any problems for these past 2 years. However yesterday the problems started occuring - the sound only works on the left side, and when I move the cable (which connects to the left side of the headset) a little, it works on both sides for some reason. I tried all kinds of methods on the internet, where, for example you need to balance the sound setting, disconnecting and connecting cables, cleaning them, removing dirt, etc. and nothing works. Same happens on my phone, i have to balance the cable while listening something on my phone too. My guess is that the warranty has ended and I will have to buy a new ones because I suspect that something is wrong with the wiring and cables. What to do apart from these options? I'm thinking of taking it to a professional to fix them or buying new ones.