Amazingly I just got one of these units and am experiencing the same issue, plugged it in, powered it up and after about 5 min loses power. If I wait a few minutes i can turn it back on and play again. If any of the other members that had this problem and fixed it please post how/what you did.
NeitherSparky: I saw this on another site earlier and might be what you are talking about, look like there are 2 clips you have to pry at.