Ok. I looked further into this today. A lot of people report issues with sensors on the large rear barn door. I'm stupid or blind but where is this sensor ? It's the last thing I haven't checked simply due to not seeing it. It's most likely so obvious and smiling at me everytime I open the door but I cannot see it. Switch on small door is at the bottom, I thought I fixed that, but now I don't think thats the issue any more.