Spindle will not stay running

Nothing too obvious

I would try running without the XBOX controller
USB devices are notoriously sensitive to noise.
 

It had no effect removing the xbox.hal and disconnecting the controller.
Something I noticed this time is I changed to qtdragon (from qtdragon_hd) so I could see the terminal window behind. In that change I noticed the "At Speed" indicator beside the spindle controls turns green when I enter the M3 S9000 and when the motor stops the indicator flashes.
The other not so obvious item is the machine 95% of the time switches to "Machine Off" but not 100% of the time.
I also noticed the secure boot was enabled, I thought I had disabled that. It is now disabled in bios.

Had an idea, dangerous I know!
I put a buck converter on the 24VDC supply to get me 10VDC for a ref voltage for the spindle output. Tested with the buck converter and of course had the same problem but it allowed for another test. Note the spindle out was at 5V then 0V when the spindle stopped.

I powered off the breaker for the VFD and put my meter on the Spindle Out/Gnd. The M3 S9000 (5V) held with no reset. I tried a few different speeds and all worked. It is some type of EMI problem.

Any suggestions on how to resolve this? I have a EMI filter on the VFD. I tried moving the VFD further away from the 7i96s and no effect.

Switching to machine-off indicates LinuxCNC sensed something
and changed operating mode.

The question is what did it sense.

Can you post you hal/ini files?

Here are the files, axis are not tuned only tested for basic motion.
I added Ferrite cores to the UVW of the spindle, checked all wires are grounded properly. They are all foil wrapped with drain. All drains are grounded. I even moved the EMI filter and VFD to as far away as I could (6 feet) without having to completely rewire. Same issue if I turn off the VFD breaker the M3 command holds with no reset, with the breaker on it resets in a second or 2. I removed the xboxctrl.hal but included it here. 
Thanks for all your assistance.

Does the machine and PC have proper grounding?