Went to the village shop to get some food and returned to find the PC fully locked up ( needed a power cycle to restart!)
I suspect this is more fault of #browsers with multiple tabs left open (there's an open issue for this on #Firefox) than any flaw with #LinuxMint itself, on top of websites being more bloated and #adtech scripts and #adblockers fighting one another.
Successfully installed #Anydesk on #Linux PC, so can access #XFCE desktop remotely from my Windows laptop (we use Anydesk a lot for remote support)