we have a problem with one user on specific device: galaxy tab !

The User have a iphone, ipad and a galaxy tab. On the iphone and ipad the Mail Application is working fine. On the galaxy tab the mail application will freezed every time. On another Android Device (Desire) the Account is working. If i use another Galaxy Tab we have the same Problem. If i use my account on the galaxy tab, all working fine.

Can anybody help`