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My guess is that it needs some forward movement to recalibrate a bit. GPS, compass heading and wheel position sensors all have to give some "normal" input before the computer can take over?
Have you tried to "calibrate" the cameras again? It does it automatically in the first 25 miles or so after delivery, but I believe there is an option under service menu to do it. I'm certainly no expert on the subject but that's what I'd try. It sounds like a calibration issue to me.
