Several times, if I run my tests, the lib files disappeared from my Exit folder. Can someone tell me the reason?

Question

If I run or debug a test, this test works, but I cannot run my main project because the lib file was not found. If you rebuild the solution, it works.

 [TestMethod]
 public void MyTestMethod()
 {
     Assert.AreEqual(2, 2 + 2);
 }

If I run the project, I get this error:

There were 3 errors during assembly. Details: error CS0006: metadata file 'OpenAccessAssemblies \ Telerik.OpenAccess.35.Extensions.dll' may not be found error CS0006: metadata file 'OpenAccessAssemblies \ Telerik.OpenAccess.dll' not found. The system cannot find the specified file. Internal exception: there was a 3 error during assembly. Details: error CS0006: metadata file 'OpenAccessAssemblies \ Telerik.OpenAccess.35.Extensions.dll' cannot error CS0006: metadata file 'OpenAccessAssemblies \ Telerik.OpenAccess.dll' not found. the system cannot find the specified file

I think that the problem in the visual studio is gradually increasing. In some cases, the visual studio cleanup file and the lib file are deleted. How can I stop a visual incremental cleaning studio?

Thanks for the help!