Just noticed it a couple of days ago. When engine is running but vehicle is stationary and any door is opened, the door open warning light will come on and then start flashing and beeping, but in a random/intermittent way. I'm pretty sure it use to only light up if a door was open and only beep if you were driving with a door open.
With the engine off it functions as it should; that is the door open light comes on solid when a door is open.
I have no idea where to start looking to fix this, other than to locate the speaker and disable it. It's not a big deal really but just another annoying failing part..