The USB cable that comes with the Ortur might not be very good. Check that the cable is not loose where it plugs into the laser or computer. Also check that the connections are clean, and that moving the cable around doesn’t give you the Windows disconnect sound.
You can also double check that your computer doesn’t have USB selective suspend or power-save enabled for the USB ports. That can be trouble as well. (read here: How to troubleshoot connection issues with USB )