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I have the same problem, but mine only started just weeks ago. Since I had the car (2019) it would always give me the 5 m/hr now recently it starts out at 5 m/hr and then drops to 2 m/hr. Any thoughts?
Could you please explain: So you are on the inside of the car, sitting down. You open the window and open the door from the outside? And that makes the fault go away?