Strange noise from Trackpad

Hello, everyone. My Mac have some problem with trackpad. There is a some strange click sound coming out when I just scroll or make other gestures. If i use trackpad 10 min that sound goes away, but sometimes it is coming out. I do not know what to do. In Apple store they cannot listen to it.

Here is a video https://www.dropbox.com/s/uwzu3xxpw7grmw...