This just started last week. Once every couple of days, my 8500 would go bonkers and indicate laser repeatedly when there is no laser (I have yet to see a real laser hit in south florida). This has happended on the highway, local streets, and in the middle of traffic. The next day, everything is normal. Anybody else have this problem? If so, is there anything that can be done or is this the first sign of failure? The unit is almost 4 years old.