Could this be a battery issue? The battery seems fine, but perhaps a new one would fix it. I've seen others say they have had this problem too. My phone has never been anywhere near water, but the sticker on the bottom of the battery is pink. Help please!
It doesn't necessarily take the blackberry in liquid or liquid splasing on the blackberry to cause moisture problems. Sweaty pocket, even, has been reported to cause issues. If the moisture indicator has changed color, the blackberry has been exposed to moisture in some way. See Got Your BlackBerry Wet? - BlackBerryFAQ. That is probably the most likely cause of your problem considering the indicator.