Really strange bug was found inside of iOS 10 (and tested on iOS 9). If you run a short 5 second video it will run like any other normal video. The video has sound, and lasts 5 seconds. You can even close the video after you view it, or leave it open in the background. It does not make a difference. About 5-10 seconds later after viewing the video, you will notice your phone simply slow down and eventually it will lock up / freeze. The only way out of it is a hard reboot. After reboot everything seems to be back to normal. This works on any device such as iPad, iPhone, iTouch running on iOS 10 and iOS 9. I haven’t had the opportunity to try earlier versions of the iOS
What is it? Memory leak? Virus? Not sure as of yet, please use caution before running the video. Due note that the video did NOT affect Android devices
How to hard reboot:
iPhone 7 = hold down power and down sound rocker
All others = hold down home button and power button.
Edit: I found an old iPod touch running iOS 8.4. And the video above had no issues locking it up. I wonder how far does this go?
Edit (December 3, 2016): The above has been patched on iOS 10.2b. It appeared to be a memory leak.