Camera freezes when in bone hierarchy

Hi

I have a camera as a child of the head joint of a character animation. This is to give the camera the natural movement of the head (including rotations and position). This all works as intended until the scene it build. When the animation starts to play the screen freezes.
This problem happens occasionally in the editor as well but very rarely and when it does happen it is possible to see that the actual animation DOES play through and the camera follows it, however the picture on the screen simply gets stuck…

sometimes this error shows up when the camera is selected:

transform.rotation of ‘Preview Camera’ is no longer valid, due to a bad input value. Input rotation is 0.380667, 0.598301, -0.385019, 0.590670.
UnityEditor.DockArea:OnGUI()

It seems like this might have some sort of relation to the other problem. But it works most of the time in the editor and no rotations seem strange. What might be causing it?

The animation is made in motion builder…

Found the solution, seems the model was going out of the screen at times, which made it required to set the culling type to “Always Animate”.