Since 4 days there is a problem with my nokia 6600 my phone keeps on shutting down and restarting.I have never downloaded any application. And this thing happens only at home as i get out of home its starts working properly. i have 2 connections of different companies 'Spice' and 'Airtel'. When there is sim of spice it gives problem at home only not outside the home and when of airtel it works properly even at home. Please someone help me with this. Has anyone ever received such messages. Thanks a million.