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What is the model number of your X1 box?
Blue screen sounds like a TV issue and not your XG2.
Comcast updates their boxes pretty much every night.
One of the things the update might impact is the HDCP handshake between the box and your TV. When the handshake fails, you'll get a bluescreen.
Here's the device that fixed it for us (Sony XBR): https://www.amazon.com/gp/product/B01CT7THLO/ref=oh_aui_detailpage_o01_s00?ie=UTF8&psc=1