Karma server does not update the application code

I have the simple test of some angularjs services.

Let's say some test fails. I fix the code, run the test again, but the test fails again, like if the file wasn't changed.

If I go to KarmaServer tab, shut-down the server, close the "Run" session (see the screen snap) and run everything again, the changes are being applied and test succeeds.

How do I avoid this restart action.