more than likely yours is either a dirty contacter (points like contact) or a broken solder joint on the PCB. either one can give intermittent problems like that.
2003 SVT Focus, Comp. Orange, EAP. Cervini's rear spoiler, Eibach sway bars, Steeda Springs, K&N filter, steeda shifter, VF dog bone, Massive camber arms and toe links.
other car: 2004 SVT Cobra Coupe, Screaming Yellow, 2.76/2lb lower...