Even New Homes

All homes need TLC and maintenance.

Electrical panels should have the screws retorqued on the terminals inside the electrical panel by an approved technician approx 12 months after installation / occupation. This is due to loosening of these connections caused by initial expansion / contraction of the connections and the wire itself and settling of the terminals screw connections.
A symptom of this could be fluctuations noted in the lighting of a particular room.