Yes, it's been running for several weeks now without a problem. I rebooted last weekend but apart from that it's been running uninterrupted without locking up. I'm reasonably confident now, so am happy to consider it fixed for the time being.
I looked at updating to 2.9 in order to implement some of the alternative GUIs (Probe Basic etc) but it seems that recent changes to Python will require further work on them and the process of installing 2.9 seems to be taking some effort. Not being a sufficiently capable Linux / LCNC user, I'm going to stick with 2.8 and Axis for my lathe system for now.
So I have Mint 20.2 Cinnamon, Linux kernel 5.10.0-8-rt-amd64, LinuxCNC 2.8.2-47 and Axis Lathe with Andy Pugh's macros. System info attached FYI:
