We had a weird situation where the power for some circuits, but not all, would stop working for a few minutes, and then start working again. I was worried that this was going to be hard to diagnose since it only happened occasionally. However, the electrician identified the problem quickly and helped me make a call to PG&E to fix it, since the problem was not in our house wiring, but rather in PG&E's equipment. The electrician also checked our wiring and told us that it all looked okay, which put my and my wife's minds at ease. PG&E fixed the problem later that same day.