So my 5.3 is doing this and has been for awhile. Scheduled this with dealership and was told it needed a trans flush. At the time it wasn’t throwing any codes and it was close to original factory powertrain warranty. After reading this post that I just found I believe they knew exactly what was wrong and decided to turn the other cheek because it was close to the end of warranty. Does anyone know if the have changed their stance to include the 5.3 ? I’m thinking it might be time to contact my lawyer and see if a class action suit might be in order.