USB Devices not found on the Nighthawk D7800 or readycloud

[MKL87]

I have two USB hard drives connected to my Nighthawk. At first, everything was viseble and reachable. But after a few hours I could no longer see or open the USBs in any way. Readycloud worked before, but now said that the router was ofline, but worked great an hour before. My internet was working fine, there was no new firmware update and I have the latest software. I turned everything on and off again, but it still can't find the two USBs 

[michaelkenward]

What firmware version do you have on the device?

A number is more useful than "the latest". (It may not be by the time people read this.) There can also be newer versions, or "hot fixes", that do not show up if you check for new firmware in the browser interface.