[Al Skierkiewicz]

Eric,
Any one signal can affect the other signals that are combined. It is unlikely that the noise component would cause problems in your configuration but anything is possible. I still point to the single failure. A defective ground takes out as many as four of your sensors, while individual wires may only take out one. I would like to understand the term "buss" in your configuration. Are you referring to common power supply connections or summing several sensor inputs to one connection?