Axis Flipping During Path Animation

[Peuf]

Hello people,

We have an issue with the Keyshot animation, we are trying to do a walkthrough animation, we are using Path type animation. But when we preview the animation it flips randomly and the camera is upside down (see video attached). We have no clue where it's coming from and how to fix it..
If anyone could help that'd be great !
Cheers