have a new job with 411 controls, it is a mod job. problem is we are getting intermittent complaints of car stopping in flight. one of the complaints was the car was traveling down from 19 and a few floors into the run the car stopped abruptly and the pi changed to the bottom floor, then they say the car ran all the way to the bottom floor, and went back into service. we have been logging a 2812 dfc/dcl fault, we have been thru all the locks, gate, dcl etc. and have never seen the car fail while we have been on site. along with this fault is a 2831 position recovery count error, and a few 2100, 2101, PSR big positive and negative slip, along with a few relieving errors. not sure if this is causing the car to shut down, as the other cars in the bank also seem to log the PSR and relieving faults, along with the 2812 door fault. I'm concerned with the 2831 fault, do you think clipping a door lock at hi speed would cause the pi to change to the bottom floor and then do a recovery run to that floor, i have checked the battery of the mlb board and it is good. 2831 fault does say maybe bad mlb board, anyone have any ideas. don't have to much experience on these units, so not really sure what errors really cause a shut down, and which errors are just a nuisance.