You're not the first for this to happen to - seems there can be a mystery current drain as features stay alive when they should have shut off. iirc one person was quoted as having a problem with the radio that was continuing on (in some kind of background mode) when TIM was enabled.

Have a search on http://forums.vwvortex.com/zeroforum?id=728 details were posted there. Good luck with the crappy search function though!