The problem with dealerships is that they employ wannabe mechanics.
They think that you plug your car into a laptop, it tells you what's wrong and you change that part.
Dealerships will charge about £60 per hour for this.
If you can find a decent garage they will read the error code from your ecu and then try to find out what is the true fault.
This will cost about £35 per hour.
5 times in 11 months is not good.
Have you any information on what the problems have been?
Audi's are a very reliable car on the whole,it sounds like the garage is not up to the job!