The problem occurs within one particular unit of an apartment complex. All other units are fine. The problem has gradually gotten worse. All electricity within the house will flicker on and off. It is most obvious with the lights but TVs, stove, and other appliances are affected as well.
At first, this would only be triggered when using a lot of electricity (ie microwave, space heater, several things at once), but now it seems to happen at random times. The tenant even gave me a scenario of when he woke up early one morning to use the bathroom and it happened as soon as he turned on the bathroom light. No one else was up and therefore minimal electricity was being used at the time.
I have had PGE come out to look at the problem and its not their end. They also told me that because it's happening to the entire unit at the same time, it most likely is a problem somewhere from the main box outside to the box inside the unit and specifically the neutral line. When he took measurements from the individual breakers inside the unit and measurements would be as high as 160ish in some parts while 40ish in others. You can also see this in the ceiling lights (unusually bright in the kitchen and unusually dim in the bathroom). This problem has also damaged several appliances and things within the house (dvr recievers, dvd players, etc).
Any suggestions? The electrician located the neutral line in the junction box. No damage or charring and the connection was still tight. He looked in the main panel outside - minimal corrosion, still tight. He added some paste to maximize conductance and that was it. The breakers inside are fine. He even opened up most of the wall switches and outlets to investigate but found nothing. Any ideas? This is a problem that has kept me up for about a month. I'm afraid of it being a fire hazard too.