We're not going to be able to help you diagnose this. Please use the Report a Problem feature in VS (top right) to report the issue. It'll give you the option of recording the scenario which is critical for sending MS the necessary dumps and information so they can look into what is going on. Without that information it is going to be difficult to figure it out.
In the interim you can search for other reports of the editor crashing. Perhaps one of them can provide a potential trigger and workaround causing the crash. You might also consider disabling any extra extensions to see if the problem goes away.