Bitron video thermostat AV2010/32 No response

I bought Thermostat but I have a problem with it.
Everything wos fine with the first setup - thermostat worked fine and sent status every 15 minutes.
I had stability problems and made an update. There have been problems since then. Now the MQTT broker is not picking up anything. Even for hours.
Restarting and update procedure sometimes helped, however, now even updating to the dev version does not help. I deleted the device from configuration.yaml I added again, nothing changes.
Changing the set point works normally. I’m sending zigbee2mqtt / Bitronvideo / set / occupied_heating_setpoint value and it works.