Change the coupler. Any part that ever gives you an issue.. nuke it.I ran into an odd issue with my Alky system too. One day I noticed the red power light was not illuminated. It just mysteriously went out and the Alky system was not working. I went under the dash and found one of the CAT5 plugs had come out of the coupler. I really didn't think much of it so, I plugged it in. I turned the ignition on and the red "power on" light was lit on the controller. I then turned the ignition off and tucked the wires back under the dash and replaced the lower dash panel so I could take the car out. I put all my tools away jumped in the car, turned the key and the light was out on the controller again. I got the tools out and removed the lower dash panel to find the CAT5 wire had come out again. I plugged it in and listened for the "click" to confirm proper plug engagement. With ever-so-slight twisting of the wire, the plug will come out. It would come out during the "tucking away" of the wiring. I noticed both ends of the plug would come out, even after the reassuring "click" during plug engagement. I'm not twisting the wires firmly at all to make them come out. Just the slightest angled pressure on the plug and out they come.
To fix it I loosely wrapped a wire tie around the base of each plug. Then joined the base ties with two more ties going across the coupler.
After the wire ties going across have been run through the base ties, pull the base ties tight. Then, pull the ties going across tight. This pulls the plugs toward each other preventing them from coming out of the coupler.
If you want to zip tie over the new coupler fine. The thing is its given you trouble for whatever reason. They are available through me or any computer store.
HTH
Julio