#Computers freeze after roughly 5 minutes

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tepid phoenix
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Hello friends, I have a problem that I don't have an answer to and I could really use some input. At work we have 3 identical computers. Last week on monday the first one started freezing. On thuesday the second and on wednesday the third. They freeze after roughly exactly 5 minutes. I tried a lot of stuff. Running diagnostics, which all came out as good. I tried to DDU and reinstall the gpu drivers, it didn't help. When in BIOS or in secure boot mode, they don't freeze. So I just formatted them and reinstalled windows. They worked without any problems for about a week now. Today after a week, 2 of the 3 started freezing again after 5mins of running. I'm waiting to get a call about the third one soon. Any idea what it could be or how I could fix it?