My iphone is glitching out after an update?

I updated my iphone 4 to the new version. But after it finished loading it shut off and now it turns on, shows the apple logo and then turns off immediatly after. I'm not doing anything to it right now but it keeps turning off then on and so on. What is going on? Should I wait till it stops?

Mine did that last update and I googled it and it said I had to reset my phone.
It sucked!
All my photos, contacts, videos, apps, everything was gone. I lost about 600 photos that captured memories.

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