Does your V1 have an IR sensor for laser radar? It's probably that infrared sensor on the V1 reacting to the infrared remote control.

Laser radar detection on a windshield-mounted radar detector is essentially useless. Even if you mounted the detector on the license plate or front grille of your car (where the cops aim their laser beam), it would simply tell you when you had been nailed, it would not prevent the citation. Because laser radar systems are always instant-on and aimed directly at the target vehicle, and because there is no "splash back" when it's being used on nearby vehicles, I don't see the point in laser detectors.

I think you should cover the IR sensor on your V1 with a piece of black tape. When I stealth-mounted my detector, I chose to simply leave the IR sensor buried without worrying about making a hole for it.