I also have a 14 edge limited and it happened again Saturday morning at 5°F so it is definitely a temp thing. Still, should not be happening. I took the whole fuse plug and unplugged it,plugged it back in and I was back in action. Happened again yesterday at 12° F and drove 23 miles turned the car off and back on (temp was then 25°F ) and still no sound coming from the speakers. Unplugged the fuse box again and when I plugged it back in everything was fully functional.
Taking it in for service Thurs and I hope they don't tell me that repairs are not covered under my extended warranty.
I hope that this is fixable because it cannot be good for the car to keep unplugging the fuse!