[jhein]

About 4-5 years ago we started having these weird, intermittent, irregular "brown outs" at our house. I have a Generac backup generator and if I would switch over to the Generator, everything would instantly return to normal. Then after a few minutes, switch back to regular power and it would be fine, until next time. I had the power company out several times and they could never find anything. They even put a recorder on my meter and never detected anything and I know we caught at least one episode when the recorder was on. The last time it happened was about 2 years ago.

Then yesterday it started again. Had 3 episodes in the last 24 hours. Now it's a little different. Instead of brown outs, I'm losing power completely, but not the whole house, but it is on at least 4 different circuits. Then, just like before, if I switch off the grid power, the generator runs and power instantly comes back in the dead circuits. Let it run for a few minutes and then everything is fine back on the grid power. I've never found anything at my panel, no breakers tripping.

We bought the house in 2008, was built in 2007. Since we bought it, we've made many changes, all done by professional electricians. We've had Two different backup generators. A major addition on the house, Outdoor heaters installed. New mini split AC unit for the addition.

I'm having my electrician come out and look at it. Any ideas?