3ds Max :: Suddenly Stops Rendering After Certain Amount Of Frames?

So I recently created a 350 frames long animation, which I then tried to render out as an .avi using the mental ray renderer.

I have it set up in the render setup to render from frame 0 - 350, I have also chosen the output format.

Everything seems to work fine and dandy, the frames are rendered out nicely but then all of a sudden after about 40-50 frames it just stops rendering. The little window containing the progress bar just seems to disappear and in the render preview window is a half rendered image.

I have tried redoing this 3 times, but every time it just stops rendering at about the same place. The first time it stopped at frame 43, the second time at frame 47 and the third time somewhere inbetween.