I've found a number of issues very similar to this, but nothing specific.
I recently had a Spiceworks server begin crashing, followed by delivery of "Drive Not Found" error during POST. If I disconnect and reconnect the SATA cable, PC boot just fine, but looses connection again within a day or two. Again, reco9nnect cable, everything works swimmingly.
I have cleared CMOS, tried with seperate cable/SATA port on mobo and problem persists. Ran drive health tests and no red flags, so I am assuming it is a motherboard issue. Just figured I'd throw it out there to see if anyone has any bits of genius for me. Thanks!
WIndows 7 64-bit OS
128GB OCZ SSD