NHTSA Complaint #11643224 — 2013 KIA SORENTO

235 r 17 104H I had a flat out tire, which led to a replacement of a relatively new tire that was bought in the middle of 2024. During the replacement process, it was found that the the tread depth dropped to 7 in 7 months or so as registered by local auto service personnel. I have been a long time driver with this type of instance happening for the first time during all these years where I had to replace the tire completely well within a year. Can a drop of 30% or more in tread depth within 7 months or so make the tire defective? Assuming that the tread depth wears out evenly, which I believe should be other way with older tires wearing out faster as tread depth decreases, a 30% drop within 7 months after driving around 4000 miles or so for a tire with 50000 miles warranty place it under the defective tire section? Please clarify.