I didn't say it was every car, but it is common, I've had it before and I know other people who have had the same problem. I am not claiming a specific percentage occurrence or anything.
So if you haven't experienced something, it doesn't exist? Even in this thread other people have reported it.
What do you want here? A long list so you can say "apart from the aqueducts, running water, sanitation, central heating, safe streets, education, roads.... what have the Romans ever done for us?".
I could easily say then that no MG4 has ever had a restricted speed issue, because I have never experienced it.