Laptop completely freezes, no error message, no BSoD

I have a laptop that worked fine for years, then it started freezing randomly. The computer completely locks up. The screen freezes, the mouse doesn't move, and the keyboard does nothing. No BSoD, no error message. I am forced to reboot using the power button. The time it takes from booting to freeze is quite random, sometimes after a minute, sometimes after over an hour. The laptop is an Acer...



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