Having some odd behavior I've not yet figure out. It could be hardware related but not convinced that is the case. I'm running Windows 10 Pro. I have 8GB DDR2 RAM, E8400 Core 2 Duo CPU. Four Samsung 850 SSD connected via a Syba 4 Port SATA III RAID HyperDuo PCIe 2.0 x4 Card and three Samsung 753LJ 750GB connected to the motherboard. All of the drives are currently configured as independent drives -- no raid, no hyper-duo. Generally, the system performs well. But at random times it will reach the point where Explorer ceases to respond. It appears to be related to disk activity in that it seems to manifest when I go to do something that requires access of a disk. I'll get the spinning cursor, and then, as I continue to try to get it to respond, it will become increasingly unresponsive, with windows no longer opening or responding to a close. Opening File Explorer, it won't refresh any of the drive icons -- they all appear as blank icons -- but the stock icons all appear. Eventually, I have to just do a reset to get it to restart and come back up. I have not yet been able to identify a pattern or a trigger so just looking for input and ideas. What's new to this system is the Syba card and SSD drives and Windows 10. Previously, I had the Samsung HDDs only and running Windows 7 Home. I started with a fresh install (not and upgrade) and added the SSD drives and card.