Very large bright light in sky below cloud cover. Stock still for 2 minutes then vanished with no exiting trajectory. Just vanished.

At about 5:20 am, sky was still dark and cloudy. I looked out of my large picture window from a dark room to see a very bright, large light in the rural sky above the foothills, which were less than two miles away. Normally there are no lights of any kind in that area of the view or horizon.
First thought was large planet or airplane. Eliminated possibility of planet as it was cloudy and seemed below cloud level. And could not see any other stars or planets or moon.
I stared at it extensively to detect any movement. But it did not move. So not an airplane.
Just kept staring at it. Then after about 2-4 minutes, it vanished from the spot. Like a light switch turning off, it vanished.
No one was with me nor in the room. It was not a reflection in the window glass.
Background: I’m 52 years old, educated and never experienced anything like this before. But I have a deep interest in physics. I was wide awake at the time of sighting.