Problem: door opening & closing continually!

I have recently have had a peculiar problem in my FSX: the door opens & closes continually as I fly, say ever 5 seconds or so.  It happens with the Baropn 59 and the B737 --stock a/c. And it probably happens with all default a/c that have "exits" or doors.

I had the samet hing happening with gear retracting and extending continually. On and off I have had either one or the other unwanted animation happening continually (gear or doors animating continually--open/close-retract/extend) all day today. I uninstalled FSX and reinstalled it and even changed keyboard and reset  my joystick buttons a couple of times. At certain moments the animation stopped but later it started again. It happens with the default a/c in a clean install and now it happened with a Carenado C340 addon I installed an hour ago (first addon to go into the clean install).

Any help will be appreciated.

Someone said do not go near a fuel pump. I tried--t has nothing to do with that, the animation continued far from the pump and it happens in flight.