I had that problem too but only on one direction (South) with my SSAG but found that the problem was the
RJ11 socket on the camera. The socket connectors didn't make contact with the cable RJ11 connector.
I tried lots of cables including a couple homemade. What I did was to put a wood toothpick to force the connector
to make contact with the socket.
I know... lazy solution but hey! It worked
. I saw a lot of people with this problem and mine was the same.
I think some batches of those cameras had a construction defect on the socket and caused that problem.
Doesn't hurt to try!
You can see on the attached image where I placed the toothpick so it maked pressure on the back of the connector.
Just connect the cable and put it on that spot! Don't make too much pressure just a little to keep the contacts placed.
Test it while guiding and see if the mount responds!