I've been noticing lately that if I try to turn the power off the FM3 while it's connected to a PC with USB, it doesn't shut completely off - the screen shuts off, but a bunch of the lights stay on. More than that, if the unit is off, just sitting there, and I plug it into a PC, usually the lights all come on. Sometimes it's not all of them. Sometimes the screen lights up to a grey screen and there's no lights. Everything seems to function properly once I actually turn the unit on, but I'm worried I'm doing something funky to it if I forget to unplug it, or happen to turn it off before the PC.