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So I bought an over lockers prebuilt about a year and a bit ago now. It is a fairly powerful PC with an RTX 3080 and an Ryzen 9 5900x. Never had any issues however now after a few hours it begins to slow down dramatically, on reboot it says CPU overheating. I have checked for loose cables and dust which is clearly not the issue.i have checked for malware and nope. Don't have many services or whatnot running and have 32GB ram so unlikely? So what is the issue? Could it be thermal paste needs replacing? Only thing I can think of since the airflow was clearly good enough for a long time