BB Curve 8900 :: Phone Keeps On Restarting

I had my phone outside with me while i was swimming. my phone didn't get wet at all and was never in the sun, and was covered by a towel. however, when i went to go pick it up, it was in the process of restarting. when it finally got to the tmobile screen, it vibrated, then turned off and restarted again. it's been doing this nonstop. i've tried taking the battery out, plugging the phone in, then putting the battery in. keeping it on the charger while it restarts. letting it die completely from it restarting so much. and leaving the battery out for a few hours before putting it back in. however, none of it has helped. I've looked at other forums and help sites, but it all says it has to do with a new os. i haven't downloaded anything on to my blackberry in months. i've seen things about using desktop manager, but my computer is broken right now, too. :/ for awhile, my memory card kept saying that it had an error and needed to fix it on desktop manager, but again, i haven't been able to use my computer.