My new 128GB 6s+ got very hot yesterday while shooting 4K video. I got a warning that the flash was disabled due to high temp. I was shooting a combo of stills and short video clips for about an hour. During regular usage I've noticed the case gets hot near the camera. Should I be concerned? BTW: Despite the warning, the video quality of the 6s+ is exemplary. I pulled it into Final Cut on my MBP and I cannot believe it was shot with a cell phone. IMHO, this rig can hold its own against a lot of higher-end video gear. Thanks in advance.