2022 Bmw X3 Backup System Problems

I have Lane keep assist set to Early with Steering intervention. LKA would sometimes shut off by itself in the 45-60 mph highway speed range in sunny weather with clear road markings, and sometimes would stay on even when my speed decreases even to 35 mph instead of 40 mph. I understand if weather is bad, LKA might not work, but I am very confused, in broad daylight, what would cause the LKA to turn on or off and deactivate/activate at different speeds? I have the standard PDC with the "forward and rear corner sensors that trigger a warning beep at approximately a 2 ft. distance from the object." Is there any way to control the distance the parking distance control sensors activate automatically like in Merc? Since I don't have Active Park Distance Control (Option ZX1) which "automatically applies emergency braking when the reversing vehicle gets too close to an object behind or at the side of the vehicle when a collision is imminent at speeds below 3 mph," would the car still auto brake for me if I am backing up reverse in a parking garage if there is cross traffic alert or I am hitting object behind me?