Dell Precision 3591 Heating, Performace and Battery Issue.

1st six months it's working fine, but struggles on battery operation, after 6 months, my N-Vidia RTX a2000 GPU started messing, it became difficult to work with the laptop. And it is a 20-year-old problem having a Core i7 and Nvidia GPU. A single heat sink is the worst design part I've ever thought of. After changing the GPU, the replacement is still facing sometime crashing and heating issues, and unfortunately, the battery is dead as always.