Error,

Bad news it's back, not running

Same dmesg error?

sounds a bit like failing hardware

Yes saying error I am running memtest

I would clone the hard disk or replace the hard disk with a backup immediately. Looks like the disk is about to fail, or it too late and has failed already.

EXT4-fs (sda2): warning: maximal mount count reached, running e2fsck

this has been flagged on the Linux file system. Sometimes typical power failures ect.. causes corruption and can be tagged as needing to be checked with e2fsck. But in your case a steady build that is acting "strange" indicates a failing disk. Or corrupt data is being written for other reasons, faulty hardware ; memory ; drive controller.



EDIT: have you ran e2fsck to check the file system?

Link here

This should reset the mount count warning. The issue is perhaps you have corrupted data, either from faulty drive or from multiple powerfailures ect without running e2fsck afterwards. (not shutting down completely prior to power off)

my .02

Realtime system did not load

Have you tried to reload linuxcnc after you get his error? Sometimes when I get this error a reload will bring it back up.

When typing this e2fsck -v /dev/sda2 I get error message you must have r/w access to the file system or be root

Use the command:

sudo

Prior to that command. Sorry forgot to put that in there.