Weird problem today — I was watching a bit of video on my iPhone, then stopped & went away for a while — it had more than 50% charge left when I walked away. When I came back, it was dead — felt warm to the touch. No buttons would work, black screen, nothing. Rebooting wouldn’t work at all. I plugged it in for a while and after an hour or so it showed that it was charging again, but at about 5% — now, after charging most of the afternoon, looks like it’s up over 90%. Not sure what happened, but will be watching it.