This is just my opinion and I think it's a great opinion, not only because it's mine but because of the possibility.
If you have your Radar Detector w/ Laser Mode ON, you are missing X, K, KA bands being shot at you.
If a leo is quick he can shoot his laser gun and when he does not get a reading flip on instant on and nail you.
There are two possibilities: A: You have time to react first to his laser shot slowing doing in time, or B: He or another leo close to him reacted faster than you and got you on regular radar (Instant On).
So if you have a reliable jammer turn your Radar Detectors Laser Mode to the OFF setting, just in case there is a quick draw leo or the following -
One leo may be shooting laser and another either being next to him or down the road in a chase car one can use instant on radar.
Hope this changes some of the minds who decide to leave their setting to Laser on.