Same thing happened here about a week ago. The caller ID was so small it was almost unreadable, and in addition, the screen thet pops up when you say "about" to the voice remote is also smaller than usual. I did a system refresh, and both notifications returnrd to normal size, but only for a day or two, Now they are both small again.
Nashville, TN here. I did a system refresh which temporarily fixed the problem. I do have another box in the hoyuse (XG2) which can access the recordings on the main DVR (xg1v4). It did not exhibit the problem.