I have a 2006 S60 AWD which I bought off lease from volvo dealership in 2009 with about 58000 kms. Now has 155000 kms. Driven maybe 10000 kms per year. Over the course of my ownership of 10 yrs have had to replace wheel bearings 5 times at volvo dealership...fronts done twice and once left rear. I think another wheel bearing has gone on right side...not sure if front or back wheel...loud rumbling noise that speeds up as car speeds up. Altho this car is awd, never had another car that needed bearings replaced more than once...one wheel...if at all. I dont drive the car hard nor put on many miles per year. Supposedly oem volvo replacement parts. Should this be happening this often?