hi
format memory card on controller and reinstal or burn image
use static IP once. if not connect use DHCP
wait minimum 3 to 5 minutes
iam using static ip.
mining pool use kano.is is best for avalon 741
9/10 times reflashing the drive fixes this. It sucks sending hardware back that has software issues. I would follow this guy's advice.
If I connect to the controller and it will not let me change the password I have learned to just re-install the software on the controller. For some reason it a sure fire way to tell its messed up. Also if it loses its configuration when it loses power.