You know what, all jokes aside, I just thought of ONE thing that might be happening. Do you have an SD Card inserted? Samsung phones haven't been too good with SD Cards lately (I've had and read issues since the Note 2), and it MIGHT be unmounting/remounting the SD Card on it's own. You would see a triangle with an exclamation mark in it saying that the SD Card failed and unmounted unexpectedly, then an SD card with a gear on it saying that it's been re-inserted and it's being mounted (no kinky boys, NOT THAT...geesh), and then a can't-remember-what-it-looks-like icon saying that the system is scanning your SD Card for errors. Actually, if this is happening, you should see a spike in battery consumption from "Media Service" in your phone. This, by the way, is also a major battery drain especially if you have a large number of files in your card.