Might also be an issue with the Zigbee network. Try swapping the TRVs to see if the problem stays with the location or the TRV.
Also if you haven’t read it yet, check out Zigbee network optimization: a how-to guide for avoiding radio frequency interference + adding Zigbee Router devices (repeaters/extenders) to get a stable Zigbee network mesh with best possible range and coverage by fully utilizing Zigbee mesh networking