Loose neutrals in the panel often cause flickering lights that people miss. Heat from a bad connection can ruin other parts in the panel after a while. Using antioxidant paste helps a lot, mainly with aluminum wires.

I tracked my video game purchases for three months last fall, and it proved my old belief wrong about lists being a waste of time. Seeing every game I bought laid out made me realize how often I was buying things I didn't really need. Now I swear by this method, have you tried it with anything else?