Please check to see if your PC is producing any minidump files, I will check those to see if they provide any insight into a potential cause of the system crashes.
Open Windows File Explorer
Navigate to C:\Windows\Minidump
Copy any minidump files onto your Desktop, then zip those up
Upload the zip file to the Cloud (OneDrive, DropBox . . . etc.), then choose to share those and get a share link
Then post the link here to the zip file, so we can take a look for you.