Front end pops, please help

[Beagleguy]

I have a 2018 Sierra 1500 Denali (6.2 liter, magna ride) and have had the upper left rear control arm nut come loose 2X in <10K miles.  It was realigned by the dealer at 6000 miles, control arm bolt loose, now the wheel is turned slightly to the right when the control arm nut is tight.  When the nut slips, the steering is very neutral and the wheel easily returns to center position. When bolt is tight (center wheel slightly to right) the steering is tight and slightly stays turned when you turn the wheel either direction at any speed.  When loose the front end pops when turned to the left at wheel locked out, only noticed turned to the left, please note: the upper left rear control arm nut is the one that has come loose.  I don't understand this front end with what I am told are the "concentrics?" but on my older cars the control arm bolt and nut tightens on a sleeve and rarely if ever comes loose.  This is concerning, please help if you know what is happening?  The control arm bolts have been all been re-torqued by the dealer and now the suspect bolt has a new nut and blue Loctite on it.  It is popping again at 11,500 miles.  I am told it is not the suspect bolt so I am asking for first hand knowledgeable help?  It has now just started popping a few times at full left turn lock out position.  It goes back into the shop at 16K miles for the oil change, no tire wear or gas mileage issues ever. 

 

My thinking is the upper control arm is miss-machined, also thinking that is on me?

 

Thank you kindly!!! 

[MBSierra17]

Unlikely, since the control arms aren't machined on an 18, they're stamped. 

 

Is this easily repeatable or somewhat random in occurrence? 

 

I had a popping noise in the front end of my truck that I would have sworn was coming from the wheel well, but ended up being the hood latch due to body flex when turning the wheel.