I had a very odd occurance not too long ago. Norton found a virus in one of my old driver packages and it was the ahcix64s.sys files in that package. Now this was one from Gigabyte that I never use, so I just let Norton remove the files. I just chalked it up to Norton being weird and making a very rare error... I have not had a virus found on my computer in years, actually, I don't think I have ever had a virus.
Anyway, I am not saying this is the reason, but you may want to look into viruses that target the AMD RAID drivers. Your issue sounds like corrupt drivers.
The MONSTER HTPC:
CPU: AMD FX-8350.||.Cooler: Corsair H80i
MB: Gigabyte 990FXA-UD7.||.RAM: 8 GB Mushkin Blackline DDR3 2000MHz (7-10-8-27-1T)
Case: CoolerMaster HAF 932.||.PSU: Corsair HX750
GPU:Asus R9 270X DirectCU II TOP.||.Audio: Creative X-Fi Titanium Fatal1ty Pro w/ Logitech Z-5300e (5.1, 280W-RMS)
Drive: 2xMushkin Chronos 60GB RAID0.||.Storage: 8TB (4x500GB Caviar Black RAID0, 2TB Hitachi & 2x2TB Caviar Green)