I am experiencing random reboots on my Extreme II SSD. About one a day or every other day. My other boot drive on the same system is a Toshiba SSD, which has had zero random reboots. Both of these SSDs are attached to the two available SATA III ports.
My System specs are:
Window 8.1 Pro - with all updates
Motherboard - ECS X77H2-A3
16GB RAM - 4 slots filled
BIOS American Megatrends Inc. 4.6.5, 1/4/2013