When the lights suddenly go out, there is nothing more aggravating to modern man. Most of the time the issue can be traced to the local electric company, but it can also be an issue with the wiring in the building. A short might develop with bad wiring, or the roof might have leaked during a bad storm and be causing the short. It does not matter what the issue is, fixing it correctly is the best way to maintain a safe electrical system that will deliver power on demand.
Whenever there is an unexplained power outage in any part of the building, it is best to call a professionally licensed electrician to deal with them. While some issues can be resolved by unplugging an excessive number of devices, some of them do require wiring changes that should be done by someone who is specifically trained to correct dangerous electrical problems.