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I have run DMESG during the disconnect and there were no messages during the time of disconnection. I ran: dmesg -w -T to follow the output. However resetting the USB device worked, so at least now I can now save a reboot: $ echo 0 | sudo tee /sys/bus/usb/devices/1-4/authorized 0 $ echo 1 | sudo tee /sys/bus/usb/devices/1-4/authorized 1 I am yet to try a new port/cable (the host is offsite).