I had a similar problem with multiple trips to the service department. I finally blew a gasket and started the Lemon Law procedure. It was a pretty easy process and I was refunded all my money except $1800 for mileage (had car for almost 2 years). I now have a newer model and things are better...
SAME HERE- I have tried 3 chargers in past week AND have preconditioned.
I believe it is Charge America that has slowed down the amount of charge we get as it is free (30 minutes). New owners/accounts no longer receive this perk when buying a new Audi/Porsche car.