Yeah, I have two places that I frequently go (_the_ 2 places really) in town which often cause me this problem. It really freaked me out the first time, too, and I think I ended up resorting to the physical key and had to read the manual to figure out to put the fob by the ignition button in order to get it to recognize the key. These days it happens enough in these two spots that it doesn't bother me as much (though it's still a pain). Usually manage to take care of locking/unlocking with assorted movement of the fob and hitting the button on the car while trying to get it into the proper zone on the side of the car.

But I think both of those spots are near enough to radio stations that I've been assuming all this time that they're causing my problems.