Just upgraded to the new 4K X1 box (XG1v4 ). If you don't hear back from me, this took care of the problem. We also replaced our old Panny plasma with a Sony 4K LED. Not much left in the way of hardward to cause the problem.
But as recently as three weeks ago, I had the freezing screen issue, and had to reboot the old X1 box.
Edit update Jan 5th, 2019. After two months with new box, NO MORE FREEZING.
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