Sometimes when I access my mail, either through me.com, or through wanadoo.fr, and also through iCloud, I get a message saying that there is something wrong with my settings and the system cannot handle either displaying mail on the screen, or sending it from my iPad. The message preview is displayed on the left side of the screen in landscape view, and when sending I can get as far as hitting the Send button. In response to the instruction to review settings, I go to Settings and click on Mail. Then, without doing anything else at all, I click on DONE, whereupon the problem disappears, the incoming mail is displayed, and the outgoing mail is sent. What is going on and should I do something about it?