Motion tracking has not worked correctly since Version 4.10.2.24 was installed. When the camera detects motion… it chaotically moves back and forth… kind of looks like R2-D2 short circuited. 
I reverted back to Firmware version 4.10.1.40 just to make sure it was a Firmware problem and not a camera problem… and it works as it used to with this Firmware version.
I have been having the same issue. It is typically when an object is moving, but staying relatively in the same spot (like a dog chewing on a bone). It seems as though the camera overshoots slight when detection the motion, then tries to correct, but slightly overshoots again the other direction, causing the back and forth. It makes the subsequent video all but unwatchable.