Reboot the scanner (switch off & on again the back power button, then switch on the front power button). If the issue persists, reboot the PC.
Verify that the scanner is on and correctly connected to the PC, then restart the Crystal Reader software. If the issue persists, reboot the PC.
Go to "control panel" then "device manager" and "Universal Serial Bus controllers", then check if there is a warming symbol on the PCI card driver named "Renesas USB 3.0 eXtensible" : in this case, right-click on this driver and try to deactivate and reactivate it (or to update it). ---------- OR ---------- On the [...]