In the app on my phone the thermostat shows the little cloud with the line through it but I can tap on the thermostat and adjust the settings. Alexa says the thermostat is not responding. All other devices in the app are online.
If I remove the thermostat from the wall and then plug it back in it will show online in the app and Alexa will connect again but after sometime does it again.
i noticed the same, however, it still functions correctly. Tap on the thermostat and you’ll have instant access. Ask Alexa to change the temp, and it changes.