Just had a service call today on a arc-fault breaker we put in 6 month ago on a service up grade ( panel, all new wiring, new switches, new receptacles ). It seems the arc-fault keeps tripping. They reset it and it trips with the hour or within 4 hours. There is only 7 receptacles on this circuit. The only thing plug in is a clock and a old fan. We check all our connections in the attic and tighten the screws in the panel. We reset the breaker and told them to call us if it happens again. Well four hours later and they just called. Before I go open the seven recptacles I thought I post somthing here for some ideas. I think it the fan but not sure what could it be.