Recently I was following a friend on the highway. I was getting a constant alert sequence. It would give some kind of alert briefly then J it out. Wait about 10 seconds and the cycle would repeat itself. Seemed as long as I was behind him it kept happening so I shut my unit off. Later I peeked in his car expecting a Cobra or the like. I found no detector and only thing strange was a sattelite radio setup on the windshield. Do these cause the V1 to false? It was really annoying.