My phone freezes, refuses to open some applications some times, switches off and restarts by itself... any idea what the problem is?

I am using iPhone 5 (iOS 7.1.2).  It often switches off and restarts by itself, sometimes it refuses to open certain applications until I switch off and restart it.  Sometimes it does not make a call through unless I switch off and restart.
Any idea what the problem could be and any advice to what I should do ?

Hi jallam,
If you are having issues with restarting and apps not launching you may want to try this to troubleshoot.
Since restarting has not helped, you may want to restore the iPhone as a new device -
iOS: How to back up your data and set up your device as a new device
http://support.apple.com/kb/HT4137
Thanks for using Apple Support Communities.
Best,
Brett L

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