I did have my power setting to turn off hard disks after 20 min. Wonder if the system did not like that. I just changed the power settings to "never" turn off the disks. Thoughts? Both of us have suggested you test your hard drives. What were the results when you ran Luigi's test? What were the results when you re-examined your cabling and re-set the SSD? In addition, the HD mfg will have a testing program on their web site to properly check your Hard drives. You need to run that on all of your drives. I have my hard drives set to turn off also, on several different machines, and that has never caused a problem. Ron