My Nspire CX CAS (3.6 with Ndless and Nlaunchy) was running low on battery, so I plugged it in before school. I came back and it wouldn't turn on, so I reset it. It stopped halfway through boot with "System Error" and the warning exclamation point triangle sign showing. After about 2 minutes, the screen turns off and won't do anything until a reset, when the process starts over.
I don't think it's Nlaunchy, as it was working fine beforehand and didn't die during an intervening startup (AFAIK), but I could be wrong. I asked about it in #cemetech (EFNet) and KermM said that he had never seen that before.