bmw e60 530d m sport 2007 auto prob

[dave123]

Hi all,i am having problems with my 530d m sport 2007, same symtoms holding onto gear 3rd and not changing up till around 2500 3000 revs,does it maybe once or twice a week then its ok again,
Had a software update and still the same, called bmw main dealer and they said nothing wrong its normal, called auto specialist and they said box is faulty will cost 2500 plus vat to repair, others say its the dpf regen, a old bmw mechanic said something that made me think and it was do i have different makes of tyres on it and i said yes he said thats your problem?.
I dont know what to do with the car im ready to sell it but i like it,has anyone had there car sorted?.
Any help i know this is e90 forum but i cant get anywhere so need some help guys
Is my car knackered i dont know,took it on a long drive and it performed great but i know it will play up again in a few days.
Its like its in DS mode when it happens but its in drive.