The front two (driver and passenger) lower plastic speaker grills rattle a lot once the weather gets warmer and the road is less than perfect. The rattle is not audible when temps are below 35 F. If I press against the plastic grill with my palm while driving on bad roads, the rattle is completely gone. Has anyone had this issue and dealt with it? Any suggestions on how to go about fixing this issue?

I researched the forum, but the only door rattle issue I saw was of the wires inside the door making the noise, but in my case I am positive it's the plastic grills. Attached image shows which speaker grill I am referring to.

 

I had the same rattle on the passenger side in my old XFR.
I fixed it 90% by gently levering the edge of the grille up a bit and inserting some very thin double sided tape along the edge, then poking it in so you couldn't see it any more, then pressing the grille on tight.
On another forum others have had the same problem and my fix didn't work for them, and IIRC the only fix was to take the door card right off and remove and refit the grille with some sound deadening material packed around it.

 

Thanks Qz, looks like I might have to remove the door card and insert the sound deadening material.