HT1296 Since I downloaded iOS 7, my iPhone is constantly turning itself off and the battery useage is twice what it used to be.  I want iOS 6 back!  How do I uninstall iOS 7?

I downloaded iOS 7.0.2, and now my iPhone 5 keeps turning itself off and the battery useage is twice what it was.  I want iOS 6 back!  How do I uninstall iOS 7?>

So, after it charged and was still plugged in, I deleted the Exchange account and then reset it holding down the sleep wake buttons until the apple logo appeared. I also changed the limit on my emails to 3 days instead of 1 week.  It turned on, so I turned it off and let it charge overnight.  This morning, it stayed on for 3 whole hours and then shut itself off again.  I had to try 5 times to get it to come back on.  Now, a message appeared that Exchange cannot verify a server, I can't see the full name of the server anymore, but it is *.hotmail.com GlobalSign Root CA from Microsoft. So I'm selecting Accept to see what happens.  I'm very discouraged, I need my phone to be reliable for my work.  It was reliable for 11 months without one problem, and now since I downloaded iOS 7, it hasn't been on for one full day since.

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