your downstream signal levlels look ok https://arris.secure.force.com/consumers/articles/General_FAQs/SB8200-Cable-Signal-Levels/
you upstream are lower than in the article (mine are lower still at 38dBmV or more)
i don't seem to be getting more than one error like yours (i just changed powered splitter and was trying to figure out if all was ok or not and saw the window range error on mine)
that said my connection seems ok, i have no idea what your issues is, but good luck!
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