Quick question, what's the average uptime on your D9's? I'm getting around 18 hours - 2 days between resets, not sure if it is normal behaviour.
Same is happening for me! It automatically restarts, I think that is the issue with my A4+'s too. It keeps restarting all of a sudden. For D9, one of my boards stopped working automatically as well. Had to send it to China for warranty. Waiting to hear from them.