NHTSA Complaint #11534561 — 2015 INFINITI QX80

The airbag system in my recently purchased (4 months ago)QX80 Infiniti 2015 is malfunctioning/failed. It is available for inspection upon request. The warning light came on within 2 months of my purchase. I took it to the dealerships for repair, was told “this is unusual for this age car & mileage” stating it was the driver curtain airbag module which I paid a large amount to have replaced. When I received the car back, the warning light was no longer on. A month & a half later, the warning light returned. Took it back to the same dealership where I am now told that when it was repaired prior it was merely a guess as to the problem & that now a different part of the system needs replacing (airbag diag system) “in hopes of this being the issue” There is also an accompanying hefty price for this repair. But I was also told (at this juncture) that if this part replacement did not take care of the problem, the next step would be to replace the airbag wiring harness which would cost $7,500.00 (total for all these “repairs” would be above $12,500) If they believe they had repaired the problem with the first repair, why do they not start there? Is/was my driver’s side airbag system working after the first repair or not or was the warning system just reset? I’m concerned that if they only can “believe” they have fixed the problem, how can I be assured that the system IS REPAIRED & will work in case of an accident? Did the system actually “work” with the first repair only to stop working or then oddly another component stop working a month & a half later? I was not able to be assured that even if the harness (most expensive repair of the 3) is replaced that this would actually take care of the problem either. I was told this is the “next step” in the Infiniti step decision tree. I DO NOT FEEL SAFE. I have looked for recall info but have not found any recalls. I am wanting to know if this problem/issue has been reported before on this make/model/year vehicle. Thank you