instantbenz said:
This might be indicative of a larger problem. A few years ago I lived in a hell hole apartment where the hot water heater broke down every few days for several weeks. The landlord said the fuses kept burning out. Later that month, when he got the electricity bill for the apartment, he came by to figure out what I was doing. He said, "You aren't using this much electricity...no one uses this much electricity." It was like what a family of four would use.
The point is that something was causing a shit ton of electricity to go through the apartment's wiring (this is what kept fnorking hot water tank). So maybe you want to check if anything weird is going on. It would seem like it would affect your other equipment too, but if you are not satisfied with the ps3 maybe you are using the 360s more and so they are feeling the effects.