Welcome.
1) Can't help much with the stereo; I don't listen to it much.....it doesn't seem that bad to me compared to my SLK/GLK/GLC or Audi SQ8 but again; I don't listen to it much. I think there is something to the earlier comment about wind affecting the sound system as well as the fact that speaker placement isn't ideal in a tiny little two seat cabin.
2) common complaint. removing any phone case will help.....also it seems to be less a problem with newer phones...
3) I've not noticed this so I'm guessing I don't rest my knee on the door handle. The next time I drive it, I'll check.
Dave
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