I had the same issue. I found the screen door misadjusted. When connected to the outside door, the screen door latched and prevented me from opening the outside door. I was able to pry the bottom of the outside door a little with my fingers and pull the door open. I adjusted the screen door so it wouldn't latch while attached to the outside door but would latch when not attached to the outside door. Haven't had an issue since.
John & Laura___Shelby & Bentley (the labs)
2017 Montana 3950BR
2015 GMC Sierra Denali Dually