MB only boots to macOS/windows after being shutdown for hours

Already posted this on apple forums but I think you guys might know better.

After reboot, I get hung up on the login screen after entering the password. Safe mode works sometimes, but last night both safe and regular mode gave me the forbidden sign when attempting to log in. Even the windows installation was showing a BSOD. I tried running the hardware diagnostic and it returned no errors, resetting SMC and NVRAM had no effect. I tried reinstalling the OS in safe mode but got the "Could not create a preboot volume for APFS install" error and gave it up.

The funny thing is that I gave up fixing it and shut down the laptop for the night. Everything worked flawlessly the next morning when I tried to resume diagnostics. This has now happened twice and after I manage to log in, everything works like a charm for both windows and macOS. No distorted sound or colors, no corrupted files, no unexpected blackouts, everything works like usual. I'm baffled.

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