Those who are having this problem... Did you try setting your timeout to, say, 3 seconds, so that the player totally powers off shortly after you turn off the ignition? Does the player still wake up after that?

Remember that nothing except the ignition wire going high shouild wake the player if it's completely powered off. Even IR signals and physical buttons won't wake the player in that state.

I've found that when I set my timeout to only a few seconds, I still have time to reactivate the player after turning off the ignition, yet it does a good job of shutting itself down quickly and preventing problems if it's still in the dash.

It was also suggested in other threads that an iffy AC jack could be the problem...

Hey, wait a minute. Those who've had this problem also reported the player was at full volume. Darn it, I'll bet that's it, then. An iffy AC jack. The thing thinks it got plugged into the wall socket so it booted in AC mode at max volume. That's the only other thing that should get it to wake up when it's in full-off mode: the AC switch detecting a plug-in.

And since the AC jack is a physical switch, it wouldn't surprise me if temperature changes (like those described in this thread) could have made it happen.

Has anyone who's had this happen ever have the AC jack problem? Has anyone ever seen the player wake up and do this but definitely NOT be in AC mode (for instance, mid volume instead of max volume)?

This makes too much sense to me, I'm going to FAQ it. If anyone can disprove the theory I'll update the FAQ.