Got a 56 reg 330i..with 37k miles

It has active steering and recently the steering has got heavy and exccelerate pedal seems harder as well Im fighting with the steering as it feels like the back end is sliding...

could it be the active steering sensor or something else...I dont go up curbs and Ive had a 4 wheel alignment done and all is ok...

has anyone got any ideas as what it could be..??
thanks