Freeze lag stuttering when pressing any key

Hi guys. i have an anoying problem. if i press any key, the fps drops from 3000 to 60 and 20, producing stuttering.

It happens when:

-using new projects

-using old projects

-using old projects that worked fine, suddenly start working with stuttering.

-using new projects that works fine, i restart unity and the stuttering is there.

-i am not using physics, nor fancy graphics, just to trace the problem, but it persists.

  • I have Win 10 pro 64bits, 8GB, I5 4690 no OC, temps are fine. GTX 970

-Vsync deactivated in Nvidia panel, in Unity, and / or in both at the same and/or different times.

  • Drivers updated.

  • i tried restarting unity but it persists.

-i have searched the forum but similar cases didnt help me much.

Please some unity dev, some stuff help me! i just cant keep working this way! How can i help you to figure this problem? i am not a complete noob in unity, i have tried lots of things before posting, even the profiler.

Here a 2 minutes video showing everything: - YouTube

This has been happening to me too lately

I also have windows 10 and a gtx 970 wih a i7 6700k and 16gb of ram.

Edit: was happening on both unity 5.4.2 and 5.3.4p8