robgriff444 That's very strange. I installed Ubuntu this year and while it was updating after the install, I looked around the interface and suddenly everything froze . No luck trying to use the mouse or keyboard.
At the beginning of last year I tried out Q40S based on Debian 9 and also experienced freezes while trying to play 0AD installed from Synaptic. Later the newer version worked installed via terminal. Late one Friday night, something went wrong and I ended up with "Unrecognised file system..."
Lastly I tried to push in a old sound card in my motherboard and the whole PC when unresponsive for days.
I took it to some PC shop to fix and it came back to life after the guy tried to boot it up for an hour,
What went wrong on all those occasions I still don't know. It's working now for the time being. It also survived may blackouts in power.