contacts deleting

Good Afternoon,
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I have had a blackberry for some time now which I use for contacts and calendar (as well as email, calls, bbm etc). I also got myself a Galaxy Tab which needed a googlemail account to use most of the functions.
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After looking into the google mail account, I found I could sync my blackberry to GoogleMail and my Tablet. AMAZING (so*I thought).
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I have a problem that when I add a contact via my blackberry, it stays there for a couple of days and then deletes its self. it is getting really frustrating now. Has anyone seen this before?
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Is there any way to set a conflict winner in a way, so when I add something via my blackberry, it does not keep deleting all my contacts?
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Thanks!
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Karl

Posted from my CrackBerry at wapforums.crackberry.com