hi there
I am new here. I have a smart passion. really nice car. but in the last few days its giving me trouble. when i drive and a reach 90km/h it loses power, and i can only drive 30km/h. evan if i restart the car it has no power. i disconect the batery for a few sec and then the power is back, until i go over 90km/h

can anyone please help???
thank Andre