Welcome to the site. I'm sure that you enjoy your 5er.
I'm in the same boat you are with the exception of the keyless entry.
Our outside speakers also, are not operating. I was in Florida this Winter at the time they stopped working.
To get by, I unplugged one of six wires in behind the entertainment unit. This allowed my outside speakers to operate. Doing so, stopped my interior speakers from operating. When I wanted my interior speakers I'd plug the wire back in. I did this just to get by until I take my rig to a dealer.
You're still under warranty..........let your dealer fix it.
2012 Dutchmen 3850RL