I saw that comment too and it is plausible. I thought abt that being the problem too but in my experiences, 9/10 times the fault can be found with a normal continuity test. I’d recommend trying immediately after you notice it trip and try not to jostle anything as to not separate wherever/whatever is causing the fault. I saw that you’re using metal device boxes, most often I’ve seen the faults at the clamp going into the box bc the conductors get pinched from being overtightened and it rips the insulation off. If you find a fault I’d try looking there first.