I “doubled up” my When conditions based on Peter’s advice to check out the Sun Events app and saw the flow resume operations.
I have now deleted the built-in Date & Time trigger and am using only the Sun Events trigger. I’ll report back in a few days to let you know if the positive change in flow behavior was the result of adding in the Sun Events trigger. If the flow runs seamlessly for a week, I’ll swap back in the Date & Time trigger to validate which trigger is truly operational with a -720 offset.