For anyone interested, disconnecting the negative terminal of both batteries (main and auxiliary) for about 15 minutes solved the night mode problem. And we didn't have to reset the radio at all, so no settings were lost.New symptom in addition to the volume fading issue... Now the infotainment system is stuck in night mode! Tried all the usual solutions, including a factory reset, and disconnecting the car battery for several hours. My wife is pretty upset as the screen is basically unreadable in daylight. I've looked on other threads, and this appears to be another UConnect software bug. I have very hopeful that the over-the-air update that is slowly being released nationwide will fix the problem. I guess we'll see. - Impatiently waiting
Still waiting on the software update...