It was in the middle of a song when I turned off the ignition, so I know it went into standyby. That was at about 5:30 pm or so. I didn't return at all to the car that night so no one was messing with the ignition. There aren't any electrical problems in my car that I know of, but this might suggest otherwise. I haven't done any syncronization for a couple weeks. I'm not sure when it started playing but it I heard it at 4am when I woke up. I got the battery recharged for free at autozone and now everything is working fine again. At the very least, if I don't pull out the player from now on, I'll shut it off before turning off the ignition.