I have a circuit connected to an AFCI breaker circuit breaker, which is running into our upstairs bonus room as well as upstairs guest room area. I changed out an outlet in one of the boxes, and suddenly we get a trip in our breaker every so often. The trip stops happening if I disconnect the rest of the outlets in that same sequence, but of course that's not acceptable since the rest of the outlets include those in the guest room.
I'm guessing it's a poorly connected ground wire. When I changed the outlet out I used a Greenie to twist the two ground lines, followed by another small ground line peeking out of the end. I then wrapped that around the ground screw in the outlet. I think maybe I'm not nutting in the two grounds correctly, but is that a common cause of a tripped breaker: a poorly connected ground? If so, is that a newer feature on an AFCI breaker?