Visual Studio is normally a very stable environment, but some times it might crash on you.  This might happen if you either install some new extension, or even if you update Visual Studio.  The latter can be rather annoying of course.

A “common” error message is the loading error, it says it can’t load some component correctly, like in the image below.

What component it is might vary, it doesn’t seem to be any pattern to it.  And some times it even give you multiple of these.