I am still having this problem. And the worst part is that it is intermittent. I booked time in the Apple Store and it only happened one time in front of them. Ultimately they believed I was having an issue and gave me a new phone but it is still happening! Sometimes I can swipe left or right to the video mode or panorama and then the camera will work again but often times I have to restart either the camera app for the Messages app it is completely frustrating and I swear to god it seems like my phone knows when I want to take an important pictured that it continues to happen… And he solves? I am running the latest software, I have over 30 GB of free space