It really sounds like something "dirty" is plugged into the conditioned side of the power -- something like an electric motor or other noisy high-current device (eg. air-conditioner). Each time it comes on, the whole circuit takes a glitch, and something new gets fried.

Hopefully the consultant will figure things out. I would start by tracing all connections to see what exactly is sharing the conditioned power. I'd also probably split the power into two separately conditioned segments, and then see which half has troubles. Then split that half, and so on..

Cheers