I do really like this app, but, if using for a long period of time it starts to lose stability and can often just leave the screen on with the start up screen, or sit there asking to select a camera. If you wanted to use the app without discovery this is a big failing. Even with regular restarts and re-installs this still happens. I should add that I've also tried using various automation app (such as macrodroid) to help overcome these issues. The only thing I found that works is a factory reset