I'm not sure if this issue was taken up in another thread somewhere (I couldn't find it), but let me add my data point.

I ran my original Mk2 in my car from July 2001, most recently with 1.03, with no odd behavior -- no suggestion of wiring problem. Then I ran 60GB Mk2a for a month or so with no problem. Tonight for the first time since upgrading the Mk2a to 2.0b11 and Hijack 2.96, I got behavior just like this. Turned off ignition, player kept playing. To test whether it might time out or something, I let it be while I went into a store. Came out 10 minutes later, the player was 3-4 song further down the playlist. To power it off, I pulled it out and reseated.

It seems like the player is running off constant positive somehow. The chances of this being a wiring fault I would say is less than 1%. I was able to reproduce the behavior in 3 subsequent trials.

More research to come.