My Pearl tends to freeze when I am shutting it down. I then need to pull the battery to get it going again. At first, it somehow seemed related to my cars bluetooth device. I deactivated that, and it worked for a while, but now it has started freezing again. This may be totally unrelated, but I did notice that the problem started again on the same day that I hooked up a wireless router in my home. Is there any possibility that could have something to do with it?