@nathan Your tail was scraping? Was that because you'd just reached level after a steep incline? How full was your battery? Almost sounds like overvoltage pushback/shut down. I'm kind of stumped.
I'm not pretending to know what your problem was. I usually tell people suddenly having trust issues with the board after an incident is to pad up and just ride it carefully until your confidence is restored or you are able to replicate an issue that requires service.