Does anyone know a good deal about MCE?

Any help would be greatly appreciated. I have read relating posts with no concrete answer.

The fault is fairly intermittent in a 35 stop building with high amount of traffic. The fault occurs once a month on the same lift each time.
The fault logged on the iview pc is motor field forcing timeout, the manual says this has to do with door obstructions. Each time the fault occurs we have no proof if the lift is being held by removalists or passengers. Is there anyway of stopping the motor field from engaging until the doors are fully closed?