Perspective camera is falling animation

In perspective camera viewport, falling animations I have ever fall.

Even re-open the scene, the camera will continue to fall.

If the camera speed to 1, it will be a slow but not me it is stopped.

Would that I had been something change the settings?

I just started having the same issue. It turned out to be my flight stick causing the issue. Try unplugging all control devices from your computer. Find the culprit!

Cause was control devices.

Once again unplug the control device, camera animation was repaired.

Thank really thank you.