Visual Studio: "Break when an exception is thrown" option gets reset randomly

I like to have VS break on any thrown CLR exception so I tick the corresponding box in Debug -> Exceptions.

But a couple of times a d开发者_如何学Pythonay this option seems to get reset to 'disabled' randomly, so I have to go there and check it again. Any ideas?

I've noticed when the solution file (aka "projectsname.suo") gets deleted, the Break on exceptions gets reset.