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Has the vehicle had a four wheel alignment after the tires were replaced?
Did the shop that did the alignment provide a printout of the before and after measurements?
They should either provide a prinout, or keep it on file. Otherwise, you don't know if they did the alignment and if so, if it was fine correctly.
An alignment issue would cause like tire wear, so I would suspect an issue there. How is the tire wearing? Is it worn out all the way across the tire or just on one edge?
So this has happened before?
Any chance you could post a picture of the tread? I know it may be difficult to get a good shot.