2010 CADILLAC STS Electronic Stability Control Esc Problems

DRIVING HOME ON THE INTERSTATE AT THE POSTED 70 MPH SPEED MY ELECTRONIC STABILITY LIGHT GOES OFF AND THE CARS ENGAGED SUDDENLY BEGINS TO RAPIDLY POWER DOWN. A FEW MOMENTS LATER I WAS UNABLE TO MAINTAIN 40 MPH AS THE TRANSITION REVIVED TO 2X NORMAL LEVELS. I WAS FORCED TO PULL OFF THE INTERSTATE AND TURN OFF THE CAR FOR A FEW MINUTES, RESTART THE CAR AND DRIVE WHILE THE TRANSITION LIGHT REMAINED LIGHT UP. OVER THE PAST COUPLE WEEKS THE ELECTRONIC STABILITY LIGHT/ENGINE POWERING DOWN SITUATION HAS BECOME MORE FREQUENT AND ALMOST A DAILY SITUATION I EXPECT--NOT A COMFORTING FEELING WHEN ON THE INTERSTATE. I TOOK THE CAR THE A LOCAL MECHANIC TODAY AND FOR ONCE THE TRANSMITION LIGHT WAS NOT ON AND THE TRACTION STABILITY SITUATION WAS NOT A PROBLEM--GO FIGURE. ANYWAY, THE MECHANIC TESTED THE CAR AND SAID THE ISSUE APPEARED TO BE MOISTURE GETTING INTO THE...