change your IDE cable on Pioneers to another 80 wire one for starters, test your memory with Memtest + and switch off ECC for memory in bios. Actually change IDE on hard drives as well to rule it out but at same time as replacing the Pio drives cable
Then look at changing the drive, still does it, then look to change psu Change PSU if total W out is less than 550W and 22 to 28 A on the 12V line.