When I try to open my rear camera in anything other than the 3:4 ratio, it starts to lag and I get the message "Warning, Camera Failed". I've already done a force restart, cleared the camera app cache and deleted it's data files, cleared the system cache and even a factory reset. I still get the error and it affects apps such as snapchat that use a full screen camera.
Yes and I do have an SD card, but I believe the issue is with the latest update which added the "night mode" to the default camera app. I started getting the error shortly after I updated.