PC randomly started restarting itself intermittently

[Windows Server]

Hi,A few months ago I replaced most parts on my PC excluding RAM and PSU, it was running very well until today. It randomly restarted itself and since then has been randomly restarting itself, sometimes multiple times in a row. The restarts happen whether I wait on the profile login screen or enter my profile. I had the PC on for a 3 hour window today after reseating the RAM and then it started restarting itself again.There are no errors shown, it just restarts as though I had pressed the button. Checking reliability history just shows 'windows was not properly shut down' every time it restart

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