Sorry in advance for the long explanation. I bought two Samsung 850 EVO SSDs and two Inateck FE2002 enclosures to hook up to my 2013 iMac and 2014 Mac Mini last week. The drive and enclosure that I hooked up to my Mini is working without issue for over a week now. However, on my iMac, I am constantly having issues where I wake up the machine to a black screen and have to reboot to get it working again. The light on the enclosure will go from occasionally blinking to a solid blue light and a reboot is the only thing to get it going again. This doesn't happen every time the screen shuts off, it is random and could be 8-10 hours before it happens again. Originally, I cloned my iMac HDD to the SSD and when I had problems I thought that the clone might be the issue. After nothing seemed to fix the problem, I clean installed macOS on the SSD and moved data back to the drive only to still have the black screen. I tried turning off "Put Hard Disks to Sleep" in the Energy Saver settings, but that didn't work. I replaced the external enclosure with a new one from Amazon, but I'm still having the problem. I replaced the USB cable and moved it to a different USB port on the iMac, but it still goes to a black screen. The only thing I haven't tried, yet, is to contact the seller and request a replacement SSD, but I don't know if that would be the problem anyway since the drive works. Are there any suggestions? As I said, I've had the same configuration on my 2014 Mini for over a week and it has been rock solid. The problem only seems to come from the iMac. Could the iMac be disconnecting the drive randomly? If so, why would the iMac be doing this and not the Mini? Both machines are on Sierra 10.12.1. Any help would be appreciated. Thank you.