Adrianvovk,
Something interesting seems to have happened. It appears that since switching to Wayland and then switching back to X11, the lockups/freezes have stopped occurring. I would imagine that neither such activity should have changed any configuration files in any substantive manner, but, the system has not locked-up or frozen now in 1 day. I need to reboot it due to some updates, but am holding off to see how many days it stays running and does not lookup/freeze up. I am leaving the web browser open and the GNOME Terminal just as I had been doing before when it frequently locked up/froze up in the past. I am still taking notice of many of the other errors I was seeing before, though I do plan to reinstall Kali Linux in the near future (once my replacement external drive arrives).
Thanks again for all your thoughts on this matter. Be it known, I remain as baffled that the system no longer hangs as I was that it was hanging in the first place!
Stuart