New FP3 won`t boot

Hi everyone,
my brand new FP3 wont`t start. I charged the battery to 100%, putted in SD-card and SIM-card. When I press the start button, the FP3 shows the white fairphone sign followed by the 4 blue bubbles fro the loading screen. But then the FP3 turns off by itself and starts over the same procedure over and over again. Does anybody have some advice for me?
Greetings Alex

(Fixed the topic title, because apparently it would turn on, but wouldn’t boot the OS.)

I would try without the SD card and the SIM card for a start.

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