does it only do this with one assembly or panel config? i have seen this when the sensor shoots through a hole in the pcb/panel. the machine sees the panel come in, but it either overshoots or moves slightly into the open area. if i remember correctly the GSM PCB sensors have a gain or intensity pot i dont remember all of the reasons we use to have to adjust these (pcb color/finish or glare off a metal surface?) but we did adjust these at times for the same issue.
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