Another update: Service Bulletin #20-NA-199, as posted by "Cutlass" recently, was performed by my dealer on Oct.7,2020. Everything worked fine until Oct. 19, when I initiated a hands-free phone call. In mid-call the whole CUE system went dead, black screen, no sound. I pressed the volume button and normal features returned. Today, Oct. 23, as I was driving in traffic, system died again, black screen. Reaching my destination, I tried reverse, drive, park, still no sound and black screen with camera symbol with a line though it. Drove directly to my dealer, showed symptom to service writer, used R, D, and P with no change. When I pressed volume button normal radio resumed but no camera views. Sometime later camera acted normal. I have informed my dealer of other owners posting similar issues on this forum, and will be trying to send a message to Cadillac Customer Relations about this ongoing glitch in their CUE system.