This power-saving feature can cause devices to disconnect and send glitchy inputs. Disable it in the Windows Power Options or through by unchecking "Allow the computer to turn off this device to save power" under USB Hub properties. Perform a Clean Boot :
The default setting on any modern scanner is a trap for retro enthusiasts. It creates high-resolution TIFFs or JPEGs, interpolating colors and applying automatic contrast correction that obliterates the careful pixel placement of the past. scancode256 best