Acer nitro 5 an515-44 shuts off, temps are fine, could the power delivery be overheating?

Hello. I have a acer nitro 5 an515-44 and i took it for a thermal paste change. After that i noticed my battery wasn't charging and i was going to bring it back to the shop to get it checked out but after a few days while i was playing the laptop suddenly started charging and stopped charging rapidly and the fps drops to 5 and back to the normal every 10 seconds or so . While gaming on battery the fps was stable and there were no drops. I thought it was the charger but it isn't i tried another genuine 19.5v 6.92a 135w charger but the same issue continued. The battery isnt charging and is slowly decharging and when i unplugged the battery and tried playing the fps doesn't drop but the laptop shuts off and it doesn't make any weird sound. The temps are fine but maybe one of the thermal pads is bad since it seems to be a overheating issue or could the power delivery be overheating? Any clues or answers you guys have is much appreciated.

[Edited the thread to add issue detail]