I had a similar
problem after some 10k miles.
In my case it was the tyres which were Bridgestones.
They had a very uneven wear pattern on the inner edge of the rear tyres.
I have changed all 4 tyres to Barum Tyres and also had the rear tracking checked at my dealers.
The results from the tracking were very interesting. I was told tht whilst the tracking was within the specification it was at the lowest acceptable end.
The tracking (Camber) has now been set at the best end of the spec i.e. lowest Camber angle and the result is outstanding.
The car has now covered some 2k miles and is very very quiet - hardly any road noise at all and no sign of wear on any of the four tyres.
I changed all four tyres as I am not a great lover of different makes of tyres on a car
I hope this helps.