Audi a3 automatic transmission 2013 . 50k km mileage .

[Pintok]

Hi hope you guys can help! 
 

i just bought a japanese import audi a3 2013 automatic transmission 3 days ago from a garrgae With only 50k km mileage. 
 

currently while driving like from a traffic stop or any long stop then do acceleration or put the car on drive with only minute gas pedal i noticed the car vibrates a little bit. This happened like 5x since i bought the car. Is this but normal? Or is there any problem? Like gearbox? Or wheel alignment? 
 

when the car run without stop no vibration or shudder experience. Hope you guys can help