UE4 crashing on opening level

Hello, I have been working on a level for a few months now. it is a huge world and I was starting to add a nav mesh volume to it. After spanning the while level it was building the nav mesh volume with 1.7 Million on the bottom of the screen. Not sure if that is why this level will no longer load but I can continue to use it but when I close the editor and relaunch it. The editor will either get stuck at 95% and attempt to verify a physics asset that Isn’t even in my project from a marketplace asset. or it’ll load and when I load my level it gets stuck at 100 and never loads even after letting it sit overnight. Any and all help is greatly appreciated.