Another change I made was getting an LSI 9201-16i HBA in IT Mode for all my hard drives; rather than using the mix of AMD provided SATA ports and ASMedia provided SATA ports. I assume the AMD ones would work okay, but I think the ASMedia ports were flaky. My last suggestion would be getting a proper HBA flashed in IT mode if you still have instability, plus it can carry on to future builds. The 8i ones on eBay go for relatively inexpensive and even the 16i ones have come down in price.