tcope25

I bought a used 2016 Chevy Silverado ZT1 4X4 with 58K miles a couple weeks ago. I love the truck but noticed when I start going about 15-17 MPH, it shifts gears and does a sudden jerk. Is this the "hard shifting" that a lot of buyers are talking about? Can I take my used one to any Chevy dealer and they will fix it under warranty or is it best to get a aftermarket tuner to fix the issue? Any info is much appreciated. Thanks!