If the USB cable connecting Antylatency with the PC is too long (even with an active cable), you should only connect Antilatency to your PC with an optical cable if above 3 meters.
If the Antilatency ground sensors fall outside the visibility range of the tracker, or if the tracker is blocked by for example the tripod of the camera, the connection might be lost.  For example, if you tilt the camera way down and the tracker is facing parallel to the green ground. The markers (green rug) must be bigger than the movement area of the camera. It does work at the edges as well, but might not be very stable.