Convenience Key not working outside 3ft range?
It sounds like an issue with the receiver/sensor for the transmitted signal. The booster they are referring to might actually be what receives the signal and they are just using the wrong terminology.
In my wife's old Cadillac that had similar keys, we did have an issue once or twice where it said the key was not detected when sitting in the car and trying to start it. On the Cadillac, there was this "slot" in the arm rest where you can insert the key and it "re-syncs" the key and receiver. Apparently some codes are transmitted from the key which may sometimes get out of sync.
Not sure if Audi's smart key has something similar. Try looking in your owners manual. There should be a section which talks about the smart key and it may have info on this.
Just guessing, though I would assume the dealer would know this if it was the case.
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