DSS should be today or within next 2 - or you can go to the FTP site and access the pre-release of 1.30 in Engineering_phase directory. I have heard the that there is an issue with RAID 6 (if you are using a RAID 6) with this 9650SE controller. Review the link below to see if this could be contributing to your issue.
aka update your 3ware firmware to the 005 version!
the only problem i have had with the 9650se is that when rebooting the staggered spinup causes drives to not get inserted into the raid. disable staggered spinup and NCQ if you still have problems possibly.