My house, built in 2005.. First owner.. Plug anything into a master bedroom outlet and the AFCI trips. Found a backwired outlet where the installer had stripped about 2" more insulation than necessary on the neutral and the bare ground was making contact.
A problem that crept up about a year later was the lighting circuit for the east side of the house would trip if you took a shower in the guest bathroom... Turns out that a wire was pinched in the bathroom light fixture and condensate was finishing the connection to the metal fixture base..
Light fixture in the toilet area of the master bath was being held by one wood screw (They put the box too close to the HVAC vent to mount it correctly.
Other than that just replacing the cheap outlets as they wear out.
My grandparents house had a Bulldog panel where the whole 3bd/2ba ran off 3 circuits since someone broke the screws off all the other breaker positions in the buss..
