Sorry for the long post. Trying to include all relevant info that I can think of. Love our 2018 DDSRT, but have had an issue that is diminishing our joy. From about 3000 miles, randomly, but infrequently the audio will have a high pitched tone that drowns out everything else. It is an annoying tone. You can hear the tuned/selected input (Am,FM.SXM, Carplay) very faintly under the tone, but the tone is the predominant sound. Volume of tone goes up and down with the volume adjustment. When it occurs it is always on startup. It never goes away without an extended (est 30 or more minutes) shutdown. Turning the stereo off makes the noise stop. All other functions of the display seem to work normally (climate, seat heaters, drive modes, etc). The dealer has been very good about it and tried to help. Of course it never drops into this mode when we leave it with them, but one time it did it when we went to pick it up and we drove right into the service bay and had everyone present witness it. My wife always takes a video with her phone to get a time stamped example when it happens. So far the dealer has changed the system amplifier twice and head unit once. We have 12000 miles on it now and all this has occured in the first 11 months of ownership. Dealer has opened a Star case with Dodge and we just dropped it back off with them tonight (the new head unit went in on Saturday and it did it again this morning). The head unit replacement was at the direction of Dodge via the Star case. We have the Beats audio system and have not modified the audio system in any way. Right now I am suspecting something in the harness, or an intermittent ground issue. Anyone out there had similar issues? If so, what resolved the problem. Alternatively, does anyone happen know where the ground connections for the Audio system are located? Appreciate any input. Thanks for reading!