The radio signal problem is probably releated to the aerial amp which is located under the panel above the rear screen, or under the lift down lid at the rear right on an Avant.
I have the same problem with the o/s front speaker which Audi couldn't find a problem with when the vehicle was still under warranty, because its intermittant.
I can cure it by briefly raising the volume, which leads me to suspect its the speaker at fault. I'll strip it down one day when it completely stops working!
You cannot prise the grill off its moulded and you'll break it, you have to take off the door panel, the screws are hidded under the trim strip that runs the length of the door.
www.youtube.com/watch?v=jNulgKsRX64
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