Thermostat Tuya TS0601 TV05-ZG - valve sometimes opens (suddenly heats)

Hey all,

I have several TV05-zg running via zigbee2mqtt and Better Thermostat (external temp sensors). Today I recognised that one off my radiators was suddenly heating up. Neither the Better Thermostat card of the room nor the Thermostat card of the radiator indicated, that the radiator should heat up, the status of the thermostat was “heating stop”.

I therefore assume, that the valve just opened up somehow.
After manual recalibration of the thermostat the valve closed completely again. I’ve done that already a few times for different thermostat because I thought that the valves sometimes not close properly.

Someone has a similar problem and found a solution for that?