Try freeing up some RAM.
Double tap your home screen. Icons will show up on the bottom, press any one until a minus sign shows up on them, tap the minus sign on all of them and it closes them out, freeing up RAM.
when my email app messes up it has always been a RAM issue.
I bought an app called xsysinfo that when you open it it does the work instead of the method I described above . I use it about once a day and it helps a lot.
Hope that helps
Support Our Troops!!
This post was Tapatalk approved. Sent from my Inc