linuxcnc 2.9.1 frezze and back to login page

I have problem with linuxcnc 2.9.1
Sometimes after start linuxcnc axis dont show correctly words (tomorow go to insert scrennshot)
Sometimes when I try to do something for example open file, mouse cursor freeze, sometimes freeze and screen is black and worst off all freeze and back to login page.
Computer is dell optilex960 before working on linuxcnc 2.7 and 2.8.4 without problems.
Last what I install new is two usb 3m extensions and new cherry keyboard.

for sure you have install correctly every pithon 3.9 libs, for sure pc works ... I use normally I5 6500 wirh Lcnc 2.9 and Lcnc2.9.1 too
but with mint19.04 ...

... you can share your SO and istallation? in teminal :

than


and post output here.

I install everytime from here  linuxcnc.org/downloads/
In video we see the problem. For example I cant homing two or more axis on the same time. Try to make for frezze and back to the login page but not lucky this time. But we see frezze couple times.
My current version  LinuxCNC 2.9.1  Debian 12 Bookworm PREEMPT-RT ISO
 

PC issue, not LinuxCNC issue.
How much memory does that PC have?
Is the processor overheating?
Did you run a memory check?

2x1GBram
How I can check processor temperature and memory check in linux?

2 gb is probably not enough anymore. I always use 4 gb

2GB is not enough.
For temperature, open a terminal and type
sensors
For memory, at boot hold down shift key and find memtest at the grub menu.

Bought HP COMPAQ ELITE 8300 SFF|i5-3470|8GB 
For now the problem has been fixed.