I have a different LCD but it is lilliput and is those old models I guess. EXACT thing happened to me when I was trying to install my second touch screen monitor. I tought it is hardware problem so I was just keep changing the USB ports by unpluging the cable and plug it in to another usb port and after few time changing, I uninstall the driver and reinstall it again for few time (2times i guess) and it started working like normal. and its more than 2 months now its working flawlessly.
so just try what I did.
wish you best luck mate