Mail/Gmail/Calendar problem

I have setup gmail app with gmail account this part works great. Now I wanted to setup company mail (IBM Domino server) in standard mail app. Once mails are synced, sync starts all over again and this happens every 20 minutes. Then I deleted the account and setup mail in gmail app. Same thing; every 20 minutes sync starts all over again and I get notifications for all unread mails. And the worst part is that it doesn't sync calendar. Well it does for 1 minute then account disappears from Calendar app. I tried to use push mail and syncing every 30 minutes, doesn't matter, same problem. Now I have to use IBM Verse app for mails and calendar and with it, everything works.
Any idea what's happening with gmail and calendar app or how to fix it? Or any idea for alternative mail/calendar app?

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