hey billvator, ive never seen a controller with dhst(down hall stop) so im assuming there is a uhst too. ive only seen hst(hall stop) and cst(car stop) on the selector so this is new for me. the suggestions of residual magnetism is very true. clean the knife edge of the relays and also to prove faults you can slip a piece of paper in between the armature and stator temp. to help fault find faults too. you can get copper tops for these relays as well.

ok does the lift stop at the same level? if so then more likely the floor level call relay is sticking but if not it could be the hall call cancel brush on the selector(for the reset coil) not working properly. i would suggest when the fault occurs that firstly check for volts at the coil of dhst then work backwards. from what i remember the stopping pulses are just that pulses to set the advancer panel(and stop dogs) to set. im assuming that xhst is a aux relay bc of the need for extra contacts.