Any power issues with the elevator or in the building? We've had a lot that due to crap power in the area have issues... some will either burn out completely (typically only the brain will need to be replaced though) others will fault out and the indicator light on the brain will stay lit causing the elevator doors to hold open until they go into nudging, in this case we found unplugging the edges for a quick minute and then plugging back in will reset them. However these issues like I said only are happening in areas where power is and has been an issue for a while or where the building experiences some type of power issue like a spike or something. Almost sounds like you're having something similar related to power possibly... maybe call tech support to get their input.