I am finding Yahoo (Xtra) email erratic since upgrading to iOS5.
It takes ages to check mail, and does not show new email. I noticed this when Push doesn't seem to work with Yahoo. Google shows similar issues for some.
If I hard restart iPhone4 it works fine for the first time. I just tried signing out of Yahoo and that got new mail quick. Don;t know if coincidental yet. Given that I stay signed in all the time (signed in, not with Yahoo Promail open) it is a bit of a pain.
Any others with this, and any solutions?