Page 85 of the current Hopper manual states that Hopper only allows one USB device to be attached at a time. I am clearly in violation of that. This may be what's causing my EHD drop offs and my OTA black screens.
Oh right and I bought my V6 so I can only use 3 cylinders at a time, how stupid is dish for that. Give me 3 USB ports and I I need OTA, Sling and EHD, but only pick one to use! I love this hopper, but these companies are so damn short sighted.