GMS 2 on a windows 2003 server.

Syddenly it stoped sending new mail or appointments to the mobile devices.
It receives items from the devices and delivers to GroupWise (gw 7.01).
(New mail or appointments made from the mobile devices are delivered and
pops up in GroupWise).

Same problem for every devices.

Tried to install gms 2 sp3, but that didn't help.
Can't find any error messages that can help me in the right direction.

Any suggestions?
Tried reset on some accounts in ../admin/diag
Can I reinstall GMS without setting up every mobile devices again?