This is an issue I've faced in all versions of Vegas
I tend to get a lot of crashes when dealing with certain files or entering pan / crop window or eventfx. My computer is a really good Dell Alienware R6 with 32GB RAM and NVIDIA geforce GTX 1080 and I'm on Windows 10 latest version. Not sure why this happens but many times I have to take a file and use Handbrake to re-encode it and then use that version of the file instead. One major culprit is videos from my Google Pixel 2. They'll crash the program whenever i hover over the file in the timeline or try to edit it, but re-encoding it in handbrake fixes this. I've noticed often the videos in question will play vertically in VLC player, but when I import them into vegas they are horizontal. And they were not filmed horizontally. The crashes happen when trying to rotate them. Re-encoding in handbrake makes them enter the timeline the way they were shot.
And finally, I often get these types of crashes with .mov files where I open the program, it crashes, open it crashes, etc until I delete the offending file from the timeline through the project media window (can't delete it from the timeline or it crashes when I hover over it). Unfortunately i work in a way that people send me their interviews / videos to edit and far too many people use apple iphones and ipads and products.