Transmission Issues on 2007 Mercedes-Benz CLS550

When driving my CLS everything seems fine, until i come to a complete stop, then the transmission slams and neutrals by itself. i then have to turn the car off the on again and its ready to go again shifting perfect as if there is no problem until i get to the next stop when it neutrals up again. What could possibly be the problem?

Asked by for the 2007 Mercedes-Benz CLS550
Check the fluid. If its low it will act like that.
Ok i will check that, thank you