Is the car always shut down at the same floor or at certain floors? I had a 211 shutting down on FLRP a couple of months ago. I caught the FS1 led in the controller blink twice as the car leveled into the third floor. The magnet was dead centered and the guides had been replaced. I saw it do it a couple times running by the floor on car top but it would not do it at the 1st floor where there is also a magnet in that lane. It was the magnet! First time I ever had something come down to a bad magnet but after replacing it there was no flicker and problem solved.