I know this is an old thread but, the OP sked for AFCI horror stories. I'm in the middle of one.
Wired new home Master bd rm, bath on one AFCI, 2 bed rms and bath on another.
No problems after wiring house
A couple months later hm owner says Mst bd.rm. tripping intermitantly.
Swapped the two AFCI positions.
A few weeks later the 2 bd. rms. breaker is tripping, but not the mstr. bd. rm.
Replaced both breakers.
2 bd. rms. trip anytime you turn on more than one light.
Checked the next day, could not get brker to trip.
Went back in the evening after hm. owner called could not get breaker to hold.
I've wired many AFCIs in the past and have had a problem with tripping but never this intermittant stuff.
Used two wire home runs, and GE brkrs
Any ideas
Thanks Mark
