Here is my origninal post which you guys were kind enough to downvote to zero.
Anyway, what I've found is that if I boot the mi box while another input is selected and active on the receiver, and then go back to the mi box after it's fully booted, the glitching issue resolves itself. If I however boot the mi box and watch it boot on the screen, the shitty glitching returns. Something must be going on in the handshaking while the box is booting to cause this issue. Hope this helps someone out.
Check the cable or the video settings. Sounds like it's trying to push an incompatible signal or the cable is no good