Just updated to 7.0 to my xbr55x700d and started doing this while i navigate with the remote in the home screen... Anyone else?
Only time I ever saw that was on my ladies Mi Box, both before & after the 7.0 update, her HDMI wasn't somehow seated properly.. worked fine except for occasionally showing a similar decay pattern on the screen til I pulled it out & popped it back in. Been awhile since the 2nd time it happened.
Make sure cables are good.