All non readonly project files "auto" deleted after specific exception

I have one solution where include some projects.
One of this is a ASP.Net Web Application project.

For all projects of this solution use one TFS 2010.

If i declare wrong the connection string to web.config of ASP.Net web application
and i run the solution from the VisualStudio, then throw exception on "Application_Start" of Global.asax ("Cannot open database '...' requested by the login. The login failed")
and if i try again run the solution, all non readonly project files is already deleted.

Same activity on
Visual Studio 2010
Visual Studio 2012
Visual Studio 2013

The Visual Studio delete this files ?
I try run the Visual Studio with switch /log, but i can't not find log with action delete.

I have same functionality when run offline the solution, or when run solution permanently disconnected from the TFS.