I went to Napa to film a wedding.  Bird flew fine and recorded just fine.  On the way home It just stopped working.  Can't get the app to stay in Video mode with any of the access windows on main screen or settings screen.  I really need to solve this.  Please if anyone can help it would be greatly appreciated!

Is it possible the SD card was full? Is there is any error message on APP?

I had a similar problem - some SD cards are faulty with unfixable write protection settings.  If you can't change the SD WP settings on your computer, that could be the problem.