Good morning, hope you are well! Just wondering if you have any updates on your issues, you are having as I too have been having similar issues. The one thing mine is doing that you didn't mention is the radio pops up with an error message saying something about power save mode when turning the car off, and a progress bar begins to scroll across the screen, and then eventually shuts off before the progress bar even completes, and this is with a brand-new battery and alternator. Thanks for any replies to this that you may have!