I had the same problem with the USB port on my original Ouya, used to pissed me off to no end because every time I would move it, it would disconnect my HD. Luckily I did not lose anything by not properly dismounting it. With the Ouya I have now I no longer have that problem. The problem was the USB port was not snug enough on the male USB plug. All a result of very poor quality control. Try wedging a wooden sooth pick to snug it up.