I am wondering if the sims has a preset key that restores a previous viewpoint? I vaguely remember you can set and return to viewpoints.
Use ctrl/4-9 to set camera angles. 1-3 are the speed controls, obviously, but you can use the numbers 4 through 9 to set your camera angle. If you set them in CameraMan Mode, they'll only work in CameraMan Mode, but if you set them during gameplay, they'll work any time. Once you've set an angle with ctrl/4, all you have to do is hit "4" and the camera will jump to the position you set. There aren't any preset default camera angles, though, so it's not something you could trigger accidentally.