Probably some of the grounds on the poles carrying the lines are broken, these grounds dissapate any induction that occurs on the non-energized equipment. this induced voltage can be upwards of 1000v.

Keep calling your utility and have your friends call. One utility had a lawsuit against them (which they lost) where the exact thing was happening to a farmers cows and they stopped giving milk. he sued and after a long period of time they repaired/made changes.

This is no joke, as the prob gets worse not better over time.
Sfene