[Problem] Louder on one side, Beyerdynamic dt 770

Hello, I have a DT 770 32 ohm that I’ve had for 3 months (bought at the beginning of July). It’s a really good headset; I was very happy with it until yesterday. I woke up, plugged it into my phone, started my playlist, and then the drama struck. The sound is louder on the right channel, but the left side still works; it’s just not as powerful as the other. I’ve tried the sound on several devices, but it doesn’t change anything, even on my PC, where I looked at the audio options and still nothing worked. So I don’t know what to do; I took off the foam from the part that covers the metal headband to check the cable that goes from the left side to the right side of the headset, and I noticed that at one point the cable was "white." I think there might be a loose connection. I believe I have a warranty of more than a year, so I’m not sure if I should send it in for repair or if there’s something I can do to fix it.