LumenRT Crashing When Placing Components

Hello,

I'm working on a highway design presentation with lumenRT and I'm currently experiencing a lot of crashing when I attempt to place a component, like painting trees into the scene.  Also, if I attempt to select a lot of components at once (like some grass) Lumen will crash.  The file is about 300 MB which I realize is getting large, but it's really difficult to clean it up when I can't select anything. 

Has anyone else experienced this problem and is it common when the files get larger?  My computer matches the required specs, and we updated the video card but it doesn't seem to have made a difference.

Thanks for your time.

Jon.

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