2003 Envoy SLE 4WD shift

My2003Envoy

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My 2003 Envoy has 115,00 miles, on 3 different occasions it has shifted from 2wd to 4wd on it's own just as if I turned the switch. I have changed all the drivetrain fluids - transmission, transfer case, Also, each time this happened I was moving very slowly (parking) and making a very sharp turn on a dry pavement. roadAny ideas ?

Help !
Thanks
 
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