this might work...
I was having the email issue non stop for the last few days - it kept force closing the app on me and drove me crazy. I hard resetting multiple times, deleting apps, recharging/discharging battery, and even deleting all of my email settings and then redoing them; nothing worked.
Then I noticed that one (of my 3) email accounts had just gotten a relatively big file attachment (4.5 mb) when all of my emails are usually sub 20K. So I deleted all the recent big attachment emails from the account and voila - no more force close all day. alternately, you could just move them into a diff email folder too.
Good luck - hope this may work for some of you out there.