Clunking noise

[Lou0211]

  I have a 2019 ltz with 9 months and 6k miles. I have had clunking noise coming from the front and rear. I brought the truck to the dealer and they repaired the front knock by tightening the pivot point bolts and putting thread lock on them? so far so good. The rear knocking noise is a completely different story. They had the truck for 17 days and  finally after using chasis ears found the problem. The dealer ended up replacing the leaf springs and was good for about a day or two. Now I'm back to the square one.  I have seen a few other articles but not on the '19. Getting to the point where I want to submit lemon paperwork.  Any insight or advice would be greatly appreciated!