Virtual Disks Disappear Randomly

I have a Poweredge R730 running 3 PERC H810 cards. Each card has an MD3060e attached to it. Each MD3060e tray is setup as RAID0 with 12 disks, so 15 virtual disks, each mapped as a separate drive in Windows. The drives specific to one MD3060e keep disappearing. They vanish randomly and when I go back to the RAID configuration tool all the drives are back in ready state and the virtual drives are completely gone. I have to re-RAID. It keeps happening over and over. I am running the latest firmware for the H810 PERC.