Congratulations and welcome to the board

Hope you've dug out from all that snow by now!!! This year we in Minnesota seem to be watching from the sidelines again as all the snow gets dumped on the East Coast. With the beast due to arrive any time now I don't care if we don't get any more snow
Stereo issue should be checked out by the dealership. I've heard of others reporting electrical anomalies as well as door-latch problems with extreme low temps, but I've encoutered no problems whatsoever with the 540 even in -15 to -20F conditions.
Please report back what you find out, and I hope it is resolved quickly.