PC randomly trying to shut down / going to sleep, keyboard and mouse input lag

[Windows 10]

Starting about 30 hours ago, my PC of several years began randomly shutting down or going to sleep unprompted. this was accompanied by laggy keyboard and mouse inputs, including symbols being typed that i didn't press. I noticed the issue seemed to happen more under load. I ran a diagnostic on RAM, system files, Storage, all of those seem to be fine. CPU and GPU temps never went above 50 degrees celcius and were generally at around 33, including when these random shut downs happen. I have the machine on a maximum performance power plan, basically all of those settings optimized for peak perfor

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