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I’ve tried all this and still the same issue. All I get is calibration failed.

So i have a DS-2SE7C144IW-AE (s5) and i am having the problem where if a subject walks or drives close to the camera it will track and zoom and record ect, but from afar (100mtrs or so) it begins to track then stops and returns home same with if someone walks behind something. my smart tracking...