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Hi my name is Robert...
What is the model or part number on the thermostat and what error are you getting?
Both a/c runs the compressor does not engage. The t-stat# ***** RVP#8330D331.
The first thing that I thought of when I saw your question was it being random, one thing I have seen with that particular set up is if you have lights with ballast in them OR you have any chargers plugged in they can cause interference. So I would try that first, unplug any chargers and try leaving the lights off if you have the ballasts in them.
Beyond that it could be a loose connection or issue wit the circuit board inside the AC unit, I do have a troubleshooting tree that you can follow, click HERE to view see the section on no compressor operation, it should help out some. IF you have more questions or concerns please feel free to contact me..... Robert
HI... I see you have not selected a rating, if you need more help please let me know... Robert