Update your post to include full system hardware specs and OS information.
PSU: make, model, wattage, age, condition (original, new, refurbished,used....). History of heavy use for gaming, video work, or bit-mining?
Increasing numbers of errors and varying errors are a sign of a failing PSU.
However, there could be other reasons:
System time/date changes - unless there is a specific reason, known to you, for the time and date changing that is another problem.
How is the computer currently configured/synchronized to get its' "time"?
Use "WIN" + "I" > Time & Language" > Date & time to check the current configuration.
Correct the time source as necessary.
Also install a new CMOS battery.
Hopefully one or the other will restore normal sleep.
If not, then it is possible that some of those shutdowns caused file corruption.
Try "sfc /scannow" and "dism" to repair.
https://www.lifewire.com/how-to-use-sfc-scannow-to-repair-windows-system-files-2626161
DISM Overview | Microsoft Docs