UR816C cannot detect driver

For some reason my UR816C has lost contact with my PC. I have tried everything to re-connect including deleting the driver and downloading the latest version. Even though the driver appears in my list of software the UR816C still can’t see it. It is not listed as a device in the Yamaha Steinberg USB Driver Control Panel or in the list of playback devices under the sound icon in the bottom right hand corner of my screen. I have removed and loaded the driver a million times with USB cables unplugged and the UR816C switched off as per the manual, but still it refuses to see the driver - my USB LED is still blinking. Is anyone able to advise?