shitd613 power / heat / software: causes of most issues.
power: EVGA only makes five PSUs with 550 watts. All provide the full 550 watts to the 12V rail, except the 550N1, and it provides 516 watts to it. I suppose the N1's lack of quality could be a possible cause. Question: Which PSU model do you have?
heat: 63-66C is nothing. I have a EVGA 1060 6GB SC gaming (single fan GPU) in one of my rigs that reaches 80C for 6-12 hours at a time and has never had a problem.
software: Download and run DDU; allow it to automatically boot your system into safe mode. Remove all Intel and AMD drivers, then allow it to reboot back into Windows normal mode. After that download and custom install latest Nvidia drivers without Geforce Experience. Any difference?