Hi, I am Dave, I will help you with this.
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.
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.
2
In the meantime, completely remove the current AMD graphics card device driver using the widely available free DDU utility, then restart your PC and go to the AMD website to download and install an older version of the AMD graphics card device driver.
A slightly older version of that driver is more stable than the latest version.