This sounds very familiar, and I'm sure there was another chap on here who thought he too was getting flashed a more usual amount of times. I can't find the thread at the moment, but sure it was this forum.
Anyway, he went to the dealer and they were indeed too high. They re-calibrated them and he was good to go. I'm fairly sure mine only reach 1.5 meters or so when facing the garage door at 5 meters or so away. Certainly shouldn't be going over cars, I'd get it checked ASAP.
If you have a similar surface you can park in front of, try uploading vid of your self levelling dance and I can do the same if it'll help confirm your suspicions.