How to fix freeze problems

I have an Iphone4 (iOS 7) and it frequently freezes.  For example, when I am hunting, it will take a very long time (20-25 minutes) for my phone to come up.  I don't know if it is because of the cold or what.  Also, if I am not using my phone for whatever reason, when I do want to use it, I will either hit the home button or the on/off button and it will take at least 5 minutes or more for it to come up.  If I don't shut my phone off at night, it will also "freeze" when I hit the home button in the morning.  If I hit the home or on/off button more than once, it will automatically take a picture by itself and it will be of a black screen.  I have icloud and have things backed up.  I have taken my phone to the local at&t store and they told me that I might have a glitch in the system.  They told me to take it to the Apple store to see what could be done, which was nothing, but at the time, I didn't have icloud.  I have had my phone for over a year now, which means that my apple care is expired, and within this time, my phone has been doing this.  I would like some answers as to what can I could do first before money is involved.  I am not looking for a new phone, just some fixing tips.
THANKS!!

Hello kaiser10,
Thanks for using Apple Support Communities.
For more information on this, take a look at:
iOS: Not responding or does not turn on
http://support.apple.com/kb/ts3281
Best of luck,
Mario

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