Laptop freezes after 10 minutes

Jan 27, 2019
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Hello, my laptop all of a sudden always freezes after 5-10 minutes of usage and Even though sometimes the "mouse" on the screen keeps moving, the apps/ internet freezes, ctrl alt del doesn't work either, I always have to reboot it. Then it works fine again for 5 minutes and no matter whether I do something or not, the laptop freezes again. I checked for viruses and malware, nothing has been detected. I tried to do the reinstallation from a date when it was still Ok, that didnt help either. Any thoughts on how to solve this / What could be the issue? Thank you

[Windows 7]