Face detection in facetracker2

Hello guys,
Did anyone have the problems with face detection in ofxfacetracker2 addon?

It can’t capture the face whole the time. For example, it capture the face in this frame and didn’t capture in next frame and then capture the face in next frame.

In briefly speaking, it’s not stable. Maybe is the problem in DLIB module.

But can I modify any code in Facetracker2 addon to get more stable performance?

Thanks guys