Netgear X8 R8500 USB 3.0 port not working solution (may apply to other models)

Like many others, I also had an isue with USB3.0 port not recognizing hard drives plugged in. It would see a thumb drive but not a 2TB disk on SATA-USB3 adapter. After some playing around I found that turning off UPnP option restores function to USB3.0 port. 

- log into router

- advanced tab

- advanced setup sub tab

- UPnP - uncheck - apply

- router will reboot

Now I see the drive same as when it was on USB2.0 but much faster. Getting 40-50mbps copying a file to desktop from NAS drive. 

Hope this helps.