If your brightness is set to 10% and you have to constantly turn the thermostat back on, try changing the brightness to 20%. This is a HomeKit issue because HomeKit sets the inactive brightness to half of the active brightness, therefore if the brightness is set to 10%, half of it is 5%. The Mysa thermostat only has the ability to change the brightness in 10% increments, so a setting of 5% would turn off the thermostats. If you find yourself having any other brightness issues, try turning off the breaker and turning it back on again.