In the big snow year 2011, I had a pine snap and take out the service drop. PG&E came out and reconnected. Last year I noticed that when the refer would kick on the lights would dim. I called PG&E and a service guy came out (on a Sunday!),checked it, and found that the ground where it comes into the weather head was not properly connected. He fixed it and now everything is fine.
While using his diagnosis equipment, he noticed a voltage discrepancy when a load was applied.
Not to say this is your problem, sounds more like a distribution problem, but this is what happened to me.