Your Door is Ajar

Landing in Chicago O'Hare and walking over to our gate for our connection we were happy we had some time to spare. It was a long redeye from Seattle. We somehow got lucky enough to get the "Plus" seats.We changed concourses and boarded the short flight from O'Hare to Hopkins -- now with the closer pitched, non-Plus seats. The plane left the gate and started taxiing to the runway."Uhh... you may have noticed that we're going around the terminal. We're going back to the gate to have a look at the door. The mechanics need to look at the door you came in on."A non-issue for the door and an hour later we were in the air for Cleveland.I'm guessing a sensor problem. Too many sensors.