I have autofold turned on and the mirrors always fold 100% of the time as I enter my driveway. The problem is they only unfold automatically about 10% of the time when I drive away. I almost always have to tell them to unfold on use the touchscreen. I usually wait until I'm at least a block away from my house to give them a chance. They almost always let me down. Is there some trick I don't understand or is it just a problem?
Maybe you are driving faster than 3-5 MPH as you exit? This is text I find on page 49 of the model 3 manual online regarding autofold / unfold:
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CAUTION: Mirrors may not automatically fold or unfold if you return to a saved location and are driving faster than 3 mph (5 km/h).
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I dont use auto fold myself, I fold them and unfold them manually when I want to use them. This is habit from my previous BMWs because they would only auto unfold once you hit a certain speed. Since many European streets are more narrow than ours here in the US, this was setup this way so that you could drive away down a narrow street without the mirrors unfolding (on the BMWs, per the forums I frequented then).
So, I dont use auto on them at all, but the speed may be what is going on for you, per that quote above.