I've been using my XRX for nearly a year. After installation, I have had great experience with good target detection.

However, in recent months, I am more and more frequently getting very exciting warnings about very nearby traffic (all less than a mile), usually at 9 o'clock, but not always, and it is never visible. Because the traffic initially shows up at less than a mile and because I never see it (and because it often moves rapidly and impossibly in relation to my a/c), I assume it is a phantom.

What can I do to reduce the frequency of these false-positive warnings?