Have you ever cleaned your computers innards?
Heat caused by dust buildup is the number one killer of PCs. Dust and animal hair floating around a room get sucked into the air vents and layer the parts like a blanket.
Or the fans clog and run too slowly. This one’s easy.
Just take your PC outside (trust me, you’ll be happy you did), open up the case and blow everything out with a can of compressed air.
Your PC will thank you.