5 month old windows 11 computer randomly restarting itself or freezing randomly

[Microsoft Windows]

I got my fiance a new pre-built desktop computer from NewEgg 5 months ago and it has recently started randomly either freezing and needing a hard reset, or initiating the restart process on it's own randomly.I've tried many things to fix it, including:Memory testCHKDSK testSFCDISMDefraggingWindows UpdateCleanbootReplaced the RAM of the computerUpdated driversNothing is overclocked...none of these have fixed the issue and it will still restart or freeze after as fast as 1 minute, or as long as 10 minutes.If it would be helpful, I can supply windows eventlogs I managed to save between restarts.B

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