When you use any plug in standalone your keylab is well detected ?
You can try to uninstall your Keylab from the device manager.
Under Sound, video and game controllers uninstall the KL.
The unplug it and reboot.
Plug your keylab again and check if it's better.
If that doesn't help you please contact Steinberg support about it as i guess this is not a problem on our side...(i might be wrong)