First off, mine is a 3.825.
I was travelling down a 35 mph industrial road that runs straight for about 2-3 miles. The nearest car was about 1/4 of a mile behind me. I was getting KA alerts to the rear that fluctuated from weak to medium. I could not make out the car behind me. The alerting continued for about 2 miles, until I rolled up to a traffic light. The car behind me finally rolled up next to me. It ended up being a pickup truck with an unknown brand or radar detector. The instant I spotted the radar detector, my V1 "J" out. The only thing I could make out on the other guys detector was that it appeared to have a flashing orange L that occasionally changed to a flashing H. So I experienced about 3-4 minutes of needless KA alerts that did not "j" out until the guy pulled up right next to me.
Later that evening, in a different part of town, I passed a car repair shop and got a week KA alert. I looked in the lot and there were 3 police cars in need of repair, atleast 1 was broadcasting KA 24/7. So no problem, I got an alert to a weak signal in a good amount of time. However on my way back (about 10minutes later, now on the far side of the street), I got a real short alert to KA with very little lead time, and an instant later it is "J" out. So it "j" out a real signal.
I just found the whole thing interesting, I don't think firmware will ever solve this, if the unit is "filtering" it will eventually "filter" a real signal.
What the V1 really needs is the ability to turn all filtering off and/or select the level of filtering desired. May be the new setting should be A, l, L, j, J