This is as funny as it is unique. Reviewers and users of the Raspberry Pi 2 have found that the board is Camera shy. If you click a photograph with a Xenon flash equipped camera, it causes the device to freeze and reboot! Yep, check out the video - The issue is not seen with an LED flash equipped camera/mobile, but does happen with a Xenon flash. Discussions from spikes due to the capacitive discharge to what not are abound. Check it out - Raspberry Pi • View topic - Why is the PI2 camera-shy ?