Does the VI get detected by your laptop under the same circumstances (same firmware, plugged into same vehicle OR emulator build)?
The emulator build is the easiest way to keep the device alive and let you verify your setup.
Assuming your firmware is configured to stay awake under the circumstances you are testing (either you have the emulator build OR you have a custom/Ford build connected to a supported vehicle CAN bus)....
Have you tried the ports on the "back" of your PC? I've seen issues with the front-mounted USB ports on some desktops.
We've also observed some issues with connection stability on certain computers, laptop and PC (windows), but the device is always detected in those cases.