Thanks everyone for their input. I've checked all the cables, all the connections and switched out converter boxes (2) as well as using the built in TV tuner. Conclusion: it just depends on the day and time. I can't find a correlation between weather, heat or time of day.
I'm going to get an amplifier for the mast and see if that helps. My guess is it will help when I can't get signals now, but will overpower the signals when they "work". This has really been a strange experience!
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