My 3-month old car suddenly stops moving

I use Santafe 2016 model - it is just a 3-month old car. Worst experience
happened to me twice when my car suddenly stops moving whilst engine is
on, the AC and Radio are both open and functioning well but the car didn't
move. After 15 minutes of changing the gear (P,R,N,D), turning it off  and
on.. the car has returned to its normal functions. It was then one of the
most terrible days of my life as there is a big truck behind me, the good
thing is the driver is just driving slowly.  Then I drove to the Service Centre
and they told me that they need to update the computer software and
stuff....after a week I experienced the same scenario but for a minimal
duration- the car suddenly stops moving for 5 minutes whilst engine is on,.
ac and radio...I again sent the car to the service centre for check up..Is this
normal for this model?