If the elevator loses hall calls it will service different floors that are programmed in the field adjustable parameters. That would explain the random calls. You must be intermittently losing the hall calls or theMiprom thinks they are lost. It doesn't know what to do because they are all outputting at once. A bad input or output can cause this. Input the calls one at a time and see if one is causing this. A lot of times a bad input or output will turn all of them on.
