R7400 No Longer Recognizes Drive via USB 3.0

I have a Nighthawk R7400 to which I've had an SSD connected via the USB 3.0 to use the Readyshare feature for over a year now. Yesterday it the Readyshare drive stopped being accessible from all of my computers. I tried rebooting the router, removing and plugging in the drive, and even reformatting the drive, but the router still says there is no drive connected to it.

I use Windows 10 x64, the router has firmware V1.2.0.76_1.0.1.