I also have a 8500 passport that flashes laser and will go off

Does this happen in the city or does it happen when you are out in the middle of nowhere? I have seen laser detectors that are falsely triggered by various lighting devices that contain wavelengths of light similar to those used in police laser.

If this is annoying and you dont want to hear it, you can locate the receiver element that detects the laser signal and cover it up with a piece of black electrical tape. That should stop whatever is causing your problem unless there is something actually broken inside the unit.

Thanks,

r