My Apollo II stops hashing after about 5 minutes from a reboot. I did notice that even when it hashes the fans show “n.a. rpm” despite the board being in the 80s on eco mode. I reflashed the device but still experiencing the same issue. My initial guess is it’s overheating since I’ve never heard the fans. When I used the device last winter the fans would spin up briefly on boot but that has not been happening.