Animate crashes every time I try to export my animation as a video

I've tried it multiple times and the same thing happens every time.

Her's what I do:

So I go to File>Export>Export video...,

Then this pops up, as normal and I click export, causing this to pop up:

And then that will run through smoothly until 100% and then a third window pops up:

This is where its gets a bit stuffy. It'll often load for ages, dipping in and out of working and not working:

Until it eventually reaches anywhere from 2% to 32% or something and then gives up completely. The window goes white and it remains on Not Responding until it crashes all together (the Animate has stopped working, close the program window comes up) and then that's the end of that:

I've used animate countless times before with smaller animations and have never encountered this problem before. My animation goes for around 7 minutes and is 99.4 MB.

Any suggests on what to do?