Freshly installed DataSync GroupWise gateway in working quite well. Syncs mail & calendar, but after a few moments mobile devices don't receive emails...

Easy fix, SLES11 console command:
rcdatasync-connectors restart

...and sync starts working again. But the command (rcdatasync-connectors restart) needs to given once or twice every hour.

Why? Tips what to troubleshoot?

Regards, Harri