Hi Nobby
Would not think it would be proxi/magnetic switch related as unless the reset involves a synchronisation run the switch state would not change, I know it sounds simple and you have probably checked but if its happening at one floor? you haven't got a flat spot on your lock rollers? when it hits this spot doesn't disengage lock enough to release? otherwise like alex75 what door gear and where is it entrapping passengers I took it as at floor level?
