This particular failure has become more than just a coincidence. My original problem I posted to this thread last year (May '23) was a combination of wifi connection stability and power failure. I managed to correct the wifi connection stability and even the power failure was good for about 9 months. Now in the last month mine has randomly shut off roughly once per week. Solution is the same as described above by each of us…unplug and plug back in and it works just fine…until it decides to shut down again next day/week/month.
Would really appreciate hearing from Rachio on this issue in this thread and something other than ‘buy a new controller’.