I've had mine for a year now and am still getting random beeps, mostly when stopped at a red light. Initially, I found that I got a lot of beeps right after a car wash and thought it was water. That is still the case when I get my car wash, so I make sure to wipe them dry. But, it doesn't beep as much or at all when I drive in the rain...go figure. I do have the front license plate mentioned. I am starting to notice a pattern when it does beep at the red light...it seems that it'll beep most when a white car passes by in the intersection. Although, DanD mentioned that the sensor will detect slight movement of the license and I can say that I've noticed beeps when cars drive by pretty fast causing a lot of wind turbulence. Mine does not beep nearly as much as the video post on this thread, so I've learned to live with the ocassional beeps. :-(