2000 chevy silverado 1500 ls reg cab 5.3ltr.

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my truck jumps out of overdrive after tacking off. it only does it once and then it goes into overdrive and everything is fine until the next time i stop and take off again. any idea what this might be. had the trans. flussed at 75000 miles and i had the trans fluid and filter changed at 120000. i now have 130000, on it. problem started after 100000 miles, not sure exactly when.