Sounds similar to what a hatchling (two, actually) I purchased a few years back did. They started doing some kinda death roll looking thing (not on the same day. A week apart or so?) then they just died. I knew something was up though when the breeder promised a refund if anything happened and then when I told him and supplied photos he never responded. And has never come back to the San Antonio show.

Anyone got any idea what caused that? And hopefully this situation of yours isn't the same. It sucks.