iPhone 5 Blue Screen/Fuzzy Reboot Loop

About a week ago my phone started acting funny. It suddenly crashed and became stuck in the rebooting loop you see on the video. After some fiddling around I can usually get the phone to reboot normally. But it started again. Any ideas ? Thanks for answers.

there is a video -----> https://www.youtube.com/watch?v=bw4n9L_S...

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