Brake Sensor problems of the 2004 Chevrolet Venture

2004 Chevrolet Venture minivan. Intermittent problem with abs & traction control. When car hits a sharp-hard bump (ie pothole) or when turning sharp to park, the alert that abs and tc turns on. Have replaced rotors and sensors by dealer and authorized mechanic. Chevy dealer denies that having wires from wheel bearing module to computer tight as guitar strings may cause temporary disconnection or bad contacts. This has been going for several years, dealer only solution is to again replace rotors (over $1000) with no guarantee that it will fix intermittent abd and tc disabling.