I do not. I have a fairly vanilla install. Only added Adblock, a guest WLAN, and split off two of the four wired ports to their own VLAN. It took me a lot of RTFM to get that far.
I still think it's a driver issue since this drive works on this router using different firmware.
Did some searching, somebody else on the forum reported this problem last year: Xhci error when mounting usb drive on Netgear r8000
And others reported similar problems during 18.06 testing: bugs.openwrt - FS#1637
If anybody has a USB3 hard drive hanging off the USB3 port on a Netgear R8000 I'd appreciate hearing more about your setup.