I have 12 systems with teh B85M-HDS motherboard. We run document scanners and SLR cameras from the USB ports. Every system has Win7-64 Professional. Everyone of them randomly disconnects the USB. The USB 3.0 port is very unstable - with SLR camera will only allow 6 remote shots before it disconnects. I have installe dexternal USB hubs which has stopped the disconnect. However I plugged an external USB Pirtable Hard-drive into USB and now the system won't boot it just displays the ASROCK screen and doesn't continue. We are now getting radom Blue SCreen of Death on these systems. Is there an issue with the IO chip?

When we move files via LAN to another PC it causes the host USB to pause, any ideas?