The gateway for that Zone has a relay that is intermittent ... If all the wires to the gateway are connected and no corrosion, etc on any of them then the gateway is of course the prime suspect.
The temp remote temp sensor can be tested by YOU if you have a multimeter and basic electrical skills... simply go on the roof if this is a ducted system and remove that Zone AC cover and locate the gateway and remove remote temp sensor and measure the resistance of the sensor versus the inside temp.
If the reading is within range then the sensor is ok...
If the Zone that you are having issues with is ZONE 2 then there is also an EOL... end of line resistor that tells the In Command RV-C chain that it is the last item in the loop//
If that EOL is bad ( resistance has changed ), or the EOL is loose where it plugs in at its molex plug connector then you will also have issues with that Zone
READ THIS LINK to educate yourself on the In Command RV-C for the Coleman AC units
It will also show you exactly where you will find the EOL
https://asasupportdocs.blob.core.win...3%20NCSP35.pdf