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If you are plugging these drives into the USB3 port, the issue is that USB3 utilizes a 2.4GHz signal and this can cause interference with WiFi signals. Now, this was an issue with the FC ICS, but the SC ICS is supposed to be better protected against this. Still, the external device can cause this interference. For starters, what you should try is using a USB extension cable to move the device further away from the ICS. You can also try moving to the USB2 port.
Hope this helps,