That depends on what you are keyframing. Camera is connected to Aim by the
Rotation transform, so moving the Aim changes the rotation of the Camera. If
you keyframe everything that is related to the Camera (which you usually do
if you use a hotkey), you keyframe the rotation of the Camera as well, which
overwrites the previous dependancy on Aim.
Solution is to keyframe only the translation (translateX,Y,Z) of the Camera
and leave the rotation alone.