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Might be worth trying in the GMOCCAPY Section, even linking back to the issue in this thread.

Was thinking about this last night, it may be worth looking at this regarding swap. Just on the off chance.

forum.linuxcnc.org/9-installing-linuxcnc...only?start=30#322251

So after further testing I can tell you that the axis GUI is rock solid. No issues when left for extended periods of time.  When I get some more time I will use SSH to poke around when running GMOCCAPY.

Thank you for the images. There are a few kernel/driver changes I'll be working around, but the experience was super easy.

Backstory: I tried to upgrade my successful installation, and the pi wouldn't boot, giving the "missing firmware" error. I copied my existing linuxcnc config files using another Linux system. I installed your image on windows. I copied the config onto the new SD card. It booted and nearly all was well.

Thank you.

Like I said before, log in via SSH, wifi it would have to be, run Linuxcnc as you would and if things lock up and SSH is still good start with dmesg then looking through logs.
Also it would be interesting to know if this happens when using axis.
A lot of the investigation will have to be done by yourself.
Obviously it's not a complete machine lockup, as you reported your pendant can still be used to move the machine, so Linuxcnc is able to receive and transmit to your mesa card.
What happens when the machine is left idle without a Linuxcnc session running ?
If are unable, unwilling to address the queries in this post and my previous post I'm afraid I can't offer any help.

I used the image from this page. The only other thing I added was Filezilla, to transfer files to and from my PC where I generate the gcode files.

And yes, pressing Ctrl-esc brings up the main rPi menu where I can select to run other applications. If I have LinuxCNC up, I can use that to launch Filezilla without exiting LinuxCNC. That functionality has to my knowledge always existed in the image.

Is this OK or any better idea?