I had a similar problem with OpenGarage being unavailable from WiFI and requiring power reset to get it to reconnect. I switch out the USB power adaptor and my problem seems to have gone away (haven’t had the problem in months, or since). I don’t know what the real issue is but the original adaptor I used was 5v 1A (came with a Google chrome-cast), I switch it out for another 5v 1A adaptor (no name brand). I suspect the issue might be related to noise for the garage door motor.