Is the Vertex 3 the one that is not responding? There was a known problem with "panic lock" with the Vertex 2 drives (Sandforce controller), and it may have carried over to some extent to the Vertex 3.
http://www.youtube.com/watch?v=S0CJ0l1BUGI
I have a Vertex 2 that has never locked up in operation, but if I change video cards on the motherboard, the drive is not recognized on the next reboot and I have to go into the BIOS to find it again. So they are definitely temperamental, but work well on the the right motherboard.