Why is my iPhone after upgrading to 7.1.1 constantly every 5-10 minutes. excluded and start again?

Why is my iPhone after upgrading to 7.1.1 constantly every 5-10 minutes. excluded and start again? does not matter what I do or make a call or play games when enabled Wi-Fi restart my iPhone??

I have the same problem on my Iphone 4 and Ipad 3. Since I have made the update the battery drains faster than ever!

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