Roof AC shuts off with engine running

Thanks for the replies. Everything I see leads me to think it's a high voltage problem, but I'm suspecting high voltage from the generator. Running the AC on Shore power isn't affected by the engine one way or the other, just while the generator is powering the AC is when the issue arises.
I tried posting the requested photos, but it looks like I need to put them on an online site first. The thermostat and ECC are definitely separate units and reside in different places in the RV. Both are Intellitec units, as is much of the electronics in the Bounder.