Try lubrication on the rams. I had this issue on a previous boat and when the rams stick the motor can't overcome the resistance. Might be a safety issue too so that any objects caught in the closing platform do not damage it since the motor stops. I did away with motor drive altogether and went with a block and tackle instead. It is interesting that my current boat, 2014 Vision 46, came factory fitted with a manual pully system which never fails me !