Hi there, I’ve rendered an image sequence in cycles, some 200 frames. Somewhere in the middle two frames seem to have a light missing. I can’t see any reason in the file, as there are no keyframes at that point in time, and the images looks fine in the render preview. Tried to change some settings back and forth in case it was a glitch but the problem persists. Any similar experience or advice? Thanks 
You may not have animated lights and still perceive a change in lighting due to animated objects occluding them.
It may not be an occlusion of direct lighting but an occlusion of secondary bounces of lighting.
Check animation of other objects.
Check if problem also happens in viewport for those specific frame. Maybe an animation off is noticeable in solid view.
Yes I also thought it must be something with the animation that I don’t see, but the issue is not present in the render viewport, only in final renders. I started my whole lighting setup from scratch. Tnx man