RAZER BLACKSHARK V2 PRO battery (2020) drain overnight even when it is turned off

For the past month I have had to charge my headset every night as if I forget to the next day it will be completely out of battery even when I left it on over half the night before and turn it off over night. It used to last around a week before I had to charge it and slowly over time it got a bit worse but I was still okay with it as I only had to charge it maybe every 2-3 days but recently it has gotten out of hand and it is infuriating the next day when I realise I didn't charge it and now have to wait over an hour for it to charge before I can use it. I have updated my firmware to the latest version and no fix so its obviously an issue with the battery but the annoying thing is that it started getting really bad just after my warranty has ended. I just don't understand how the battery is draining even if I turn it off so I'm wondering if anyone else has ever had any issue like this with their headset