Stall Problem -- 360 F1

Does anyone have a 360 with F1 that stalls? Mine stalls going down a steep incline in first gear when I apply the brakes, just prior to a speed bump. It doesn't seem to do this if I am coasting down the hill in neutral, and never stalls anywhere else. Another 360 owner I met said that his does the same thing when he is backing out of his garage in reverse down his steep driveway.

The local Ferrari dealer couldn't solve this issue and basically gave up. Just wondering if anyone else has this happen, and if a solution was found.