1
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.
Please do not upload a very large Memory.dmp file.
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... etc.), then choose to share those and get a share link.
Then post the link here to the zip file, so I can take a look for you.
2
You indicate you have no space on your C drive, that may be a contributing factor to the crashes.
Download the free TreeSize app from the Microsoft Store.
Very Important - to run TreeSize, you must right click its icon and choose Run as Administrator.
Please provide a screenshot of your C drive in that TreeSize utility, so I can see your hard drive and work out where that space is being used and if there is an underlying problem.
Please ensure the full TreeSize window is in the screenshot, there is information on the top and bottom bars I needs to see.