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Your results sound consistent with what I have experienced with the implementation of RealSense in the Unity game creation engine. Please bear in mind the following factors:
(1) When you move the hand very close to the camera, the camera will lose detection and tracking will stall, because the camera can no longer identify the individual hand joints at that range.
(2) When moving your hand back away from the camera, ensure that you are keeping the hand relatively level with the height of the camera lens. It is very easy to unconsciously drop the hand down when pulling it back and drop it out of the camera's view, also causing the tracking to stall.
For very close range detection, the cruder Blob Tracking method works better than Hand Tracking, as it simply recognizes the palm as a flat-ish mass rather than looking for individual joints. The trade-off is that Blob Tracking is poor at long-distance detection, requiring the hand to be very close to the camera.