Your English is great, better than mine! I forgot to do the tests as I was taking apart my Fana CSP V3 and changing a few things. Are the stutters you have perfectly timed? They occur at a perfect interval (example. always 1 seconds apart, or always 1.5s apart, or always 0.25s apart, etc.)? And do they happen no matter how low or high your framerate is (eg. stutters still happen even when framerate is 40 fps and even when framerate is 200 fps)? If your answer is yes to both questions then you most likely are suffering from the same type of stutter me and Tero mentioned.