iPhone 6 plus iOS 8.2 UI bug
if you are watching media when portable hotspot is enabled you will got this 🙂
iPhone 6 Plus, iOS 8.2
Try a reset of your iPhone. Press and hold both the Home button and the Sleep/Wake button continuously until the Apple logo appears. Then release the button and let the device restart. You will not lose data doing this. It's like a computer reboot.
You can send feedback to Apple here: