So. I bought a krytac trident crb 64 days ago

and yesterday it started behaving like it was dead with full battery's. When I put a new battery in it would give me 5-10 weak sounding shots and die. I tried it with multiple of my own battery's and one of the fields and nothing worked. My battery's worked in someone else's gun though. What could it be and what do I do?
I'm using 11.1 20c valken and asg triple cell
Thanks