Edit: Better idea! Try re-running the OS X Mavericks 10.9.4 Update (Combo); it's a tried and true troubleshooting technique...particularly when nothing else has worked.
That's a good idea. Maybe I will do that once a day.
Thanks, Artie. It's such a mystery why this is happening.
MacBook Pro - M2, Ventura 13.6 Safari Tech Prev 17.0 Safari 16.6 Firefox 116.0.2 iPhone 7 Version 15.8