aggy00,

1. Tyre pressures - 28-29 front. 30-32 rear dependent upon your weight
2. What tyres do you have fitted - plus get the wheels re-balanced at the dealership
3. I had a 'duff' tyre from new and had a similar situation but managed to get it swapped
4. Get delaership to double check that all nuts & bolts have been tightened to the correct pressures as part of the pdi

Not sure if the above helps, i'm sure other members will chip in and fill in the missing bits to check up on...

WB