When you say “missing out parts of the animation”, some of the frames are missing or do you mean that some chunks of where you expected there to be particles there aren’t any?
In the case of the latter, I’ve had minor freak outs similar to that and then realized that the viewport settings were set to load the first 1% which will show only a small piece (ie. not evenly spaced through the particle set to make a sparse cloud like normally).
If that isn’t it, can you post some screenshots to describe the issue further?