Wirelessly posted (BlackBerry 8700g: Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.0) BlackBerry8700/4.1.0 Profile/MIDP-2.0 Configuration/CLDC-1.1 VendorID/100)
Do you have it set to network or blackberry? I have mine set to blackberry and its rock sold on keeping time.
Options -- Date / Time -- Date / Time Source
Hope this helps