I was looking at all the advice posted on the 3 amigos recently and came across responses from Disco Mike (the Disco Master), he provided a similar answer on one of his posts but I took at a bit further. I've had the 3 amigos on and off for the past 2 years. Disco Mike mentioned something about brake dust causing issues with the hub sensor so I hosed both sides of each wheel, climbed underneath and got every bit of grime and brake dust off and let it dry overnight. It been a month and over a 1000 miles and haven't seen it since.