I put some insulation in the attic and in the process touched a wire that went into the bedroom ceiling fan, the wire was loose and it knocked out power in the bedroom only. The rest of the rooms on the same circuit had power. I called an electrician because I was not comfortable messing with the wires.
When the electrician arrived, I explained to the issue and where the issue was. One of them went up in the attic and saw the wire I was talking about, this wire carried power into the room. They claimed to not know where the wire was drawing its power, they spent 90 minutes opening every outlet, light switch and light fixture on the circuit to check the wires. They even took the cover off the electrical panel. One of them told me they were getting close to the hour and may have to just run a new power wire. Then the other one went up to the attic and said, this wire has power so the issue must be in the connection in the ceiling fan. They opened the ceiling fan and found a loose wire in the connection. They tightened that connection and everything was working again.
About five days later that same circuit breaker tripped and would not stay on after resetting. I called the electrician back, the boss insisted on sending the same guys out because they had already been there and seen the wiring. The same two guys came, asked if I knew the issue, I said no. They did some testing and determined there was a hot wire touching a neutral somewhere in the circuit. They got half the rooms in the circuit on but still had to figure out the other three rooms. One guy then opened up a switch plate that housed two switches and pulled out the switches. I didn't see what he was doing before that. He then said this switch has a hot hooked up to the ground. They disconnected the hot from the switches and said these may have been a three way but they did not need to be there. They hooked the other wire back to the switches and the circuit came on again.
I have lived in this house for 8 years, that double switch has always been there. No one has ever touched it and it has never been an issue. After eight years, it decides to interrupt the circuit and trip the breaker so it won't turn back on? They charged me for both visits.