Here's what mine does to me..... I use comcast mail synced through my mail app on my PB. My iPhone checks for new mail every 15 minutes. While the iPhone is checking the mail it upsets the PB mail by giving this error whenever I go to check my mail. I usually have to turn the phone OFF to check my mail unless I am in that 5 minute window when the iPhone is not hanging the mail server up. See attachment. Does this happen to you?