I just returned my 2 week old Z as the reception was so bad. They gave me a new phone and it has better reception and a lot better battery life. When they gave it back they told me they copied all the setting for my old to my new now every now and them I get a blank white screen with a momentary flash of the Google sign in box.I can't access it,I went to setting and made sure all the sign in stuff was correct, short of a factory reboot is there anything else that can be done? Also anyway to backup my contacts so I won't have to spend a day putting them all back in?