A couple of times during the past few weeks, my wife has been using the hair dryer in the bathroom when the dryer suddenly stops operating and then, maybe 5 or 10 seconds later, the circuit goes out. The bathroom is on a CGFI circuit. When I check it, the circuit breaker has tripped on the breaker panel but the reset button on the CGFI outlet has not popped out. What might be causing that? I thought the CGFI would always trip before the circuit breaker because it is more sensitive to faults.