I have PNY CS900 2.5" 2TB SATA III SSD installed in my H500 and it was working fine until the latest H500 firmware update. 
issue: the PNY CS900 2.5" 2TB SATA III SSD being detected by the H500 (however it may take a few minutes), but will loose connectivity with the drive within a few days or hours. The had indicator is not on. 
 Soft reboot of the H500 via app doesn't fix the issue. The PNY CS900 2.5" 2TB SATA III SSD not being re-detected. 
I have to physically unplug H500 from power, wait a few seconds and then power it back up.

PNY CS900 2.5" 2TB SATA III SSD Will then be detected but it takes a few minutes. 
the drives was working just fine until the most recent H500 firmware update.