my iphone keeps restarting randomly 5s

HI, so my iphone 5s just started rebooting randomly. wouod screen turns blue, then turn off and restart. I've also updated my phone to ios 9.1 last night. I got my phone taken far sunce August and I just returned it yesterday but this thing restart just started this morning and I do not know what is wrong. someone help olease it would be greatly appreciated. Thank you!

Use iTunes to restore your device iOS to factory settings

Tags: iPhone

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