I started getting this message lately. The warning says "Blind Spot Limited - Camera Visibility Reduced". All cameras are clean and without any dirt on them. This could be a coincident, but it started when I received 2019.16.2 with continuous Sentry mode recording. It seems to me like when the cameras are active more than usual, this problem pops up. I park at work parking lot and during the day, and it just happens that many people pass by my car during the lunch hour to get to their vehicles. When I get into my car after work, I usually have a warning on my dash stating “Sentry even has occurred". Im going to turn off this feature or activate the location based mode so that it will not record anything at work, and see if this has anything to do with it. Some say they heard from service that it's a firmware bug. Anyone else has issues with this on their Model S? Sean
UPDATE -- Cleaned all camera sensors, although they already looked clean. At the same time, received the new 2019.20.1 update. Between the two, something fixed the issue. I haven't seen this error since.
Mine was due to my flash drive being full from the Sentry mode on my Model 3. Once I cleared the files, it was fine. I believe there was a tweet about this and a firmware fix would be coming.