I experienced the same thing the other day. It was lying there with its arms tucked in. I thought it was dead, so I tapped on the glass. Suddenly, it ran at lightning speed and entered the web tunnel.I walked into my room to check on things with my red light, and I saw her in what looked like a death curl, and upright. I didn't touch her, I was talking aloud and upset and then I saw her suddenly correct herself into a perfectly normal position. Should I be worried or should I be expecting a molted spider tomorrow? Should I go and try to give her water? I typically thought they only went into what looked like a death curl when molting on their backs, but do they flip themselves over at the same time? Please help, thank-you.