2003 Chevrolet Suburban cruise control problems

Vehicle: 2003 chevy suburban crash: as vehicle was slowing down to an approaching intersection with a stop sign (in a neighborhood) speed limit approx 25, the vehicle suddenly accelerated to high rate of speed (cruise control activated) causing driver loss of control, vehicle left the road hitting a mailbox, telephone pole and final impact (t-boned) with a parked ford f150 extra cab pickup truck sitting in a driveway with a lawn trailer attached.

Revving of engine to point of screeching tires. Sometimes feeling of being in neutral for a second then clunk in tranny/rear end? Acts as engagement of cruise control increasing speed, not able to disengage by hitting brake. Computer did not show anything. Next time putter "locked out" tech's. Puter replaced. Worked good for two weeks. Engine revved, hit patch of ice, totaled out z-71. Thank god, no injuries. Fighting it for appx 16000 miles. 72000 to 88000.