I have the exact same problem with one of my timers. Flaky response after not being used for the winter. Very frustraing. Signal is strong. Even trying to control via bluetooth doesn’t seem to work. Usually getting an error saying the timer didn’t respond in time. Furthermore I now see settings for Device Groups (only in the App). Where are the instructions for that? Online manual doesn’t have them. And I can’t see my second device via your website.