IPhone help apps keep closing randomly?

I have updated my i phone and the games but for some reason when I'm on Facebook or playing a certain game it closes out of no where I only have 11 apps so I know I have plenty of memory and I've tried restarting it. Anything advice would help thanks!

I think you have to keep limited no.of applications in your IPhone!

How or who did the update of your phone. Maybe it is os error. Like the electric volumes becomes higher when you open up that app and that makes it closes. Or i mean can't handle by the cpu. Maybe you need to overclock it or underclock it. Not optimize or stable.
mine android when i recharging it, it becomes buggy.closes app, and touch typing error.