Mine has similar symptoms. It is a Mk2a with the latest software and Hijack, and twice this week it has come back on in the car sled after the car's ignition is shut off. I had just been reading Laura's message, and ran out to the car to move it into the garage before a passing thunderstorm with reported hail arrived. Luckly for me I went out to move it, since the player was running and from it's temp had been on for some time. Oh, and the hail never materialized ... also lucky.