Hello Sir, Following are some tips and trick that will assist in solving the problem:
Try restarting the computer and then inserting the usb in usb port.
Try all different ports one by one also try some other usb cables (the cable might got faulty and hence it could mal-function).
Try Un-installing and re-installing the device drivers (if any).
Reset the device to factory default settings.
Best of Luck, Regards, Waqar.