Agree with Mike, this might be something you have to *shudder* take it to the dealer for. I've not seen this at all in mine and it's been in some pretty heavy downpours as well as plenty of water-crossings up to the design limit. My guess is you have a bad seal that's either allowing humidity in, or worse case scenario, you have an actual leak somewhere you haven't noticed yet.That sounds like a warranty issue, if it is still in effect.