We do not have a garage so our audi is parked outside. it wasn't starting randomly so we took it to the dealer. the battery was sitting in a pool of water because the metal box the battery is in couldn't drain. that caused a circuit board to short circuit. they claim the issue was with the sunroof having debris like leaves clogging the drainage system.
Vehicle began starting roughly 1/4/2018. took it to the audi dealership, where they determined that the timing chain and tensioner have failed. vehicle has 50,000 miles.
The glue that holds the panorama sun-shade to the side rails fails in hot climates. separation from the side rail guides causes the sun-shade to catch and tear. this part cannot be repaired and must be replaced at the cost of $1500+. i contacted audi and was informed that the failure of the glue is not a common issue despite finding dozens of similar complaints online and finding local repair shops that report replacing dozens of sunscreens per year for exactly this reason. i truly believe this is a manufacturer defect and should be treated as such and replaced by the manufacturer.