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@FitR6 my situation was very similar. I had gone to the dealer on 4 occasions for the sunroof. It would have been more, but my roof was relatively quiet in winter which lasts pretty much 6 months here, so I had a limited window to look at fixing it. My noises started at 3 months, or at least that's when I first noticed it. The first time around they [partially] pulled down the headliner, applied some padding and whatnot, no remedy. The subsequent 2 visits resulted in some type of work, none of which remedied the problem. I made a bit of a stink (but like you tried my best to remain calm and collected) for the 4th visit. I demanded that they take a better look and I referred to the earlier posts here, including WestcoastGT's full sunroof replacement. Initially I was told by their lead customer service rep (in lieu of their manager who was away) that they would replace the entire sunroof assembly, but if it did not work they would not do any further work, and if this replacement caused any other noises they would also not address any of those. Needless to say I got their manager on the line and said this is completely unacceptable warranty practice. I had the manager himself ride with me in the car, and like all prior visits with their lead mechanic, he also heard and acknowledged the noises. They did some "investigation" on the 4th trip, where they also tested another car on the lot which also had a noisy sunroof, called into corporate, and corporate deemed it normal and not willing to repair since another car on the lot did it and returned my car. Needless to say this was the last straw for me, and then when the car was hit in January and subsequently repaired, that's why I got rid of it, I considered it a lost cause, I was not happy with it.
I do genuinely hope Kia gets to the bottom of this and some owners see reprieve. I was the most disappointed in myself that I mainly purchased the Stinger because I had expected more of Kia's purported "halo car" which had issues that were seemingly unresolvable. I had some kind of thought that since there was a special Kia Stinger hotline, the car would get the attention it deserved, and that the 5 year warranty would cover every issue I had, which I told the sales people before I bought the car that I will nit-pick every nuisance on the car and they said "that's fine, we will make sure you are satisfied." I left the car and brand woefully unsatisfied, which is a shame because other than my nit-picks, the car was actually pretty damn good.
FWIW, I am still very happy in my change to the M240i, I have next to no complaints so far, and I sure hope it stays that way otherwise my next vehicle might be public transit, better for my sanity lol. I don't mention this because I think any more highly of BMW than Kia, I just want to say I'm glad I didn't move into another massive disappointment, just rather a bit of an overpriced yet very fun vehicle with [so far] satisfactory quality.