I bought a new V-1 about 5 mos ago and i havent had any problems with it until the other day. I drove past one of those radar trailers they put out to tell you how fast your going and it didnt go off at all . Usually it goes off way before i get close to one of those. And later that day i went past another trailer and it went off as usual. So i drove past the first trailer again today and again it did not alert and i know both times the thing was on because it told me how fast i was going. Could anyone tell what the problem may be? Thanks in advance.