hi, went out lastnight to the shops,as started driving I noticed that the gear selection on the dash was flashing it was stuck on D while driving.wouldnt go to performance or manual mode.car sounded fine but no gear change,it was stuck in one gear,when I stopped I put in her park the P was flashing.later went back in the car to drive home and everthing was back to normal no flashing and all modes were fine,gear changing was fine.anyone have any ideas ?