Audi A3 2016: Pre sense system fault/Brake malfunction/TPMS failure/Wont start

[x3la]

I was sitting in the car in the parking lot, engine not running. Listening to music.

I added a single mp3 to the jukebox from an SD card and then the dashboard lit up with a series of error messages:

Audi pre sense: system fault!
Hill hold assist: unavailable
Screen down/up
TPMS: Tire pressure System malfunction!
Hill hold assist: unavailable
TPMS: Tire pressure System malfunction!

occasionally:

BRAKE: Brake malfunction

etc..

Sometimes I cannot lock the car with the key fob.

I cannot start the car.

What on earth is going on?

Here's a video: https://www.dropbox.com/s/uf4xb9g6ingl2ec/20201104_171500.mp4?dl=0

Hope you can help!