When I record screen and webcam (Logitech c920), the webcam video shows many quick freezes. See this video I did yesterday, just for testing. Notice the freezing of the image when I blink at 2 seconds. This only happens when I record the video using Camtasia (2018). The same happened with Camtasia 9! I see this problem in many Youtube videos. People are experimenting the same issue. It seems that Logitech C920 and Camtasia can't work together. If I record the video using only the webcam, the problem does not happen. What is going on? I'm about to buy the new Logitech Brio model (that is expensive), but I worry if the same issue will happen. There is also another problem: video and sound does not sync many times.