IPhone 4S iOS 6.1.3 problems?

Does anyone else's iPhone like the one I said above close the Facebook app constantly? I'm on Facebook lots of times a day because a good friend of mine doesn't have a cell phone so Facebook is how I talk to them. But I'll be in the middle of a message and it will just close and go back to my home screen. All the time. At least 5 times a day minimum. How can i make it stop? I've only had the phone since September 2012 and I bought it under virgin mobile if that matters.

It's called crashing, Your phone MIGHT be low on storage, check how much data you have left in settings > general > usage, if you have plenty of space maybe your facebook needs an update, hope this helps

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