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Hi OP, it isn't something we have any documentation on as a forum, but a few of us have felt a change in steering feel after a software update that makes me believe there is something going on there.
Personally, the steering feel on my car has changed twice.. Once when it came in for a steering rack recall (the entire steering rack was replaced and the car was reprogrammed), and again recently when the whole car was reprogrammed during a recent service.
That said, while the steering on my car has gotten firmer/heavier, it is consistent every time i drive the car.
If you are having an intermittent very heavy steering, I think there might be an issue with your power steering and my GUESS is that they haven't driven it when it has the issue.
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