1999 Cadillac Sedan Deville fuel data center

1999 Cadillac Sedan DeVille mileage: 101,500. During warmer weather (above 48 degrees F) the fuel data center will start cycling sporadically through the various displays. The "Change Oil" light will flash on and off during this event. Eventually, the ECM and BCM will start throwing codes such as Data signal lost between BCM and Data signal lost from ECM. Without spending hundreds of dollars buying new ECM's, BCM's, and Fuel Data Centers, have you ever heard of this occurring on this make and model of vehicle before? If so, what is the procedure for diagnosis and what is the repair made to it? (This one has thrown me!)