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I disconnected all power supplies except for the one powering the mesa board and I still get the same error every 45 seconds. 
These are the lights on the mesa board 

When is disconnects, is the init light illuminated on the 7I76E?
 

tommylight wrote:

Can you power off the machine and leave only Mesa powered?

I turned everything off except the PC and it no longer disconnects on its own and it doesnt show my mesa connection. But when I turn the mesa board and the machine on it starts disconnecting again every 45 seconds. So now I think you guys have a good point and maybe this could be hardware related.

Also make sure all power management is disabled on the host PC
Similar issues can come from Ethernet (EEE) or PCIE power management

I had a problem with a Mesa board disconnecting a couple years ago.

Turned out it was a bad/weak DC-DC power supply.  Voltage would drop intermittently, causing the Mesa to reset and I'd get the 'error finishing read' nightmare.  Looked like a network issue, but @PCW helped me diagnose it as a power problem.

Maybe double-check whatever is powering the Mesa and see if it's dodgy.

Can you power off the machine and leave only Mesa powered?

I did not try another LAN cable.
The machine and PC are grounded properly.
I dont have a DVM at the moment but as soon as I get one I will measure those.
I believe this is a software issue because even with qtplasmac not running I get the disconnected error every 45 seconds
 

Did you try another LAN cable?
Is the machine and the PC grounded properly?
Use a DVM and measure between Mesa 24V GND and machine case, in AC mode, while the machine is ON, post result.

 

Sounds like host or 7I76E issues

Whats does

ip a

report?
 

 

What does:

sudo chrt 99 ping -i .001 -q -c 60000 [card_ip_address]

report? (it will run 1 minute then print statistics)

[card_ip_address] is either 10.10.10.10 or 192.168.1.121 depending on 7I76e jumpering

I don’t think it is Plasma/EMI related. My plasma cutter was not connected or turned on.

Is this possibly Plasma/EMI related?

That is, do you still get communication loss when the Plasma source is off?