My fiance's iPhone4 is having intermittent issues with retrieving mail. She has 1 gmail account and 1 exchange account setup. About half the time, regardless of being on wifi or 3g, when she checks mail she gets an error popup "cannot connect to mail server". I've compared her iphone4 email settings and mine. Identical. I've never gotten this error on my iPhone 4 or on my 3G. What gives?