VS2015 at 20-25% of CPU when I finished the tests

[ComptonAlvaro]

I have noticed that when I have finished to run my tests, all it seems ok, but when I try to write, to modify the code, VS starts to use 20-25% of CPU and I have a lot of delay when I press the key and the text is write in the screen.

When I do nothing, the CPU is at 0%, I wait and continue in this way, until I try to write again, then the CPU is at 20-25% again and so on.

I have tried to close some process from the task manager, to try to find the process that makes this, but I don't find it. Just I see that the VS2015 process consumes this % of CPU.

I have to exit from VS and open again to continue working, but this is annoying because I lost the green and red dots that mark the tested code.

EDIT: I have noticed that when I try to run again a test, in the OpenCover test window, clicking right in one test, the option cover with OpenConver is disabled.

I have tried to to rebuild the solution, and refresh the tests in the openCoverUI window, but the problem is not solved.

[slavapr]

I cannot event run tests.
"Cover with OpenConver" is always disabled.