Did you get to the bottom of this? My advice would be to get a diagnostic check to see if there are any fault codes. When exactly does it happen? Start up/engine off etc if in motion what speeds etc.
Had a response, it is t going to be this 🌄 nth as they've had low numbers agreeing to meet up. Suspected die to covid as a lot of their members are older generation. I've asked John to keep me posted ☺️
I can completely understand where you're coming from, and I'm surprised Audi didn't offer it as an option to you. My other advice would look at getting nit fitted by a professional retrofitter. Most of whom are former VAG employees