Why does my lg rebel 4 lte show an android bot saying android starting

Why does my lg rebel 4 lte show an android bot saying android starting up with downloading percent 0 to 100, telling not to turn off phone when booting up /resting sometimes? It has started doing this maybe week ago doing it only a few times?? I have uninstalled few apps and my cleaning apps thinking that was it but I believe it still does it.