messaging and facebook running in background. Swipe and they return. Did clear cache and rboot to no avail. Both apps show a closed lock on top of screen.???
So? Android will kill them if it needs the RAM space. That's how Android works. Keep killing apps, and some of them keep popping up again - because Android's algorithms figure that they'll be needed. (This isn't Windows, where you want as much free RAM as possible, it's Android, where you want as little free RAM as possible.,)