Two problems related to transmission slip out of gear have been reported for the 2014 Chevrolet Silverado. The most recently reported issues are listed below.
Backed my truck down a boat ramp. Put my truck in park while applying parking brake truck rolled back into water. When pulled out I noticed my truck was back in park. I believe truck jumped out of gear.
I was driving down the road at about 45 mph when my vehicle suddenly jumped out of gear into neutral. After about 20 seconds it went back into gear.