What are your PC specifications?  What's your network speed? Is it over ethernet cable or wifi? Was IAE going on when you were playing?

I play SC regularly and actively in the testing  environments of the alpha, (so even more buggy and exponential than the live build) on Linux and crashing to desktop is rare from my experience. 

8hr+ stream with other Linux users 
https://rumble.com/v3wl31p-star-citizen-lug-meetup-iae-2953.html

Siege of Orison (here I had to quit and go back in becauseI got trappedin a shuttle that clippedI to another):
https://rumble.com/v40j6ba-star-citizen-diaries-naade-vs-crusader-ships-of-the-siege-of-orison.html

Full history of playing SC
https://odysee.com/@thedarthtux:f?view=content