Iphone 4s exiting out of apps and causing other trouble?

My iphone recently has been exiting me out of apps and just not working. My messages take forever to send and i'm not recieving some messages at all. I believe this all began after the newest update. My phone is practically full and I have used all 16 gigs and i'm not sure if thats the reason. I looked under diagnostics and usage and "backupd" is what it says almost all of the time. I would like to know if this is a software issue or an issue with the actual phone.

Its a software issue. Jailbreaking iphone may have caused this problem. If your iphone isn't jailbreaked then contact your apple store. It might also be issue of phone.

An easy fix that works sometimes but seems stupid is just downloading an app any one

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