Flat terrain on a 45mph urban environment with plenty of traffic. LEO was driving around with C/O Ka on the opposite traffic (slow/right lane) while I was driving on the fast/left lane. My V1 (3.863) picked him up at around 1500ft with 2 dots alert. It lost the lock, went silent and then gave full alert at around 500ft. Is this normal the C/O ramp up may not be "picture perfect" every time or my V1 is going out of tune?