Sonoff Zigbee TRVs not switching on

Hello all.

I have a little issue with Sonoff Zigbee TRV’s.

My currently setup is as follows I have a Sonoff SNZB-02D per room which acts as the temp sensor for better thermostat. When better thermostat calls for heat for a room the heating kick in and the TRV hvac action is set to heat that given room with the TRV set to 25degree C. And when not calling for heat the TRV vac is set to off and the heating is switched off. This is all done by automation. But sometime the TRV does not go into heat. And for it to wake back up I need to turn the required temp up to full for it to want to kick the hvac into action.

Any ideas how I can fix this not 100% sure if it’s a TRV issue or a Zigbee network issue but spent time making sure my wifi and zigbee network are not where near each other in the 2.4G band.

It seems that the the desired temp need to be 0.2 to 0.3 degrees higher than the current temp for hvac on the TRV to work.