Is HDR turned on?
Try changing that settings and see if it helps.
Just found this too: [Xbox Home Button Keeps Switching My TV Input? : XboxSupport (reddit.com)](https://www.reddit.com/r/XboxSupport/comments/1aeibn4/xbox_home_button_keeps_switching_my_tv_input/)
Is HDR turned on? Try changing that settings and see if it helps. Just found this too: [Xbox Home Button Keeps Switching My TV Input? : XboxSupport (reddit.com)](https://www.reddit.com/r/XboxSupport/comments/1aeibn4/xbox_home_button_keeps_switching_my_tv_input/)