This issue has been affecting me for far too long as well.  I have tried this as a latest attempt at a fix.  It worked once for a good while, but it has eventually reverted back to It's old ways of locking up after about 20-30 minutes. 

I have found this is not an exclusive Ubuntu issue.  I also have the same issues with Fedora (34 and up), but the time the VM runs is far shorter on Fedora.

Linux VMs get slower and slower then locks and video goes out.  No other option exists but to "reset" the VM.

I'm seriously considering dumping VMWW and moving to virtualbox instead to see if I can get better results.

The level of frustration with this is insane and I can't believe that VMW has not affected a fix for this yet.