Luckily electric cars won't become the dominant fuel choice in my opinion. Average household has 4 cars so infrastructure couldn't cope. Unless their plan is to stop us all driving which won't surprise me. Especially with the 15 minute cities, zone thing the corrupt, tyrants want to bring in.
I'd be getting this to Audi asap as it sounds like the cars turning nout to be dangerous. If it bought it on finance it might be worth speaking to the finance company telling them the problems and that the car isn't fit for purpose
I'd recommend a diagnostic check to see if any fault codes flag up.
What condition is the battery? As low electrical power can cause various issues.
Could still be the servo.
5 years or 120k whichever comes first I think for Cambelt. Definitely make sure service history is good. And oil changes for gearbox and quattro system. Check out buyers guides on YouTube