Electrical Questions? Ask an Electrician Online.
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1) More than likely, there is either a loose hot phase connection at the meter socket or at the main breaker lugs. The problem could also be with the utility transformer. Your service entrance wires are comprised of 2 hot phases.
2) If a loose hot phase wire termination, the service wires will expand when current is flowing and contract when minimal or no current flow. At night time, the panel typically has a minimal amount of current flow as this is expected due to loads not being utilized as much as compared to day time use. Therefore, the service entrance wires are contracting due to a loose connection and the home now experiences partial power issues.
3) I recommend that you contact your local electrical utility provide and have them confirm things on their end. If no trouble found from the utility, then a licensed electrician should check things out at the panel and at the main panel breaker.
4) If the problem is only limited to 1 single pole circuit breaker, then the issue is with that circuit and not with the utility or service entrance wires.