The power on one of our circuit serving the garage and outside outlets goes off, but the circuit breaker does not trip. It used to go off for a few minutes/hours and to come back on for days/months. Now it is seems to be off most of the time, but still comes back occasionally for a few minutes without us doing anything. There is pretty much nothing connected on the cirsuit currently, except for the garage door opener. I checked all switches and outlets and wiring is fine. There is a bathroom GFI on the circuit, but there is no power at its input, and I did reset it just in case.
Can this be caused by a defficient circuit breaker?