I have a 3G iphone with the latest software. It's synched to an Exchange 2003 server. It occasionally (sometimes once a day, sometimes 2x a day, sometimes every other day) loses its email sync and a white screen appears on the email screen. A hard reset doesn't help. I exchanged the phone for a new one but the problem still occurs. This AM I was on the web using WIFI, then went to check my mail and the blank white screen appeared. I restored all settings via itunes and am now fine. No problems with our exchange server. Has anyone experienced this problem - it seems to be an Apple software issue. Any help would be appreciated.