i have nokia 5230 which i bought it 2 weeks ago today it was working fine like usual but suddenly it lost all its bars and its blank now i tried everything like doing the manual setting thing or restarting the nokia took the battery and sim out and even reset the phone but still didn't work i went to the store but then the connection came back so they said its working fine but then came back home and the problem returned and its a 1 day now plz help thanks..