switching gears on 2006 Mercedes-Benz CLK500

hey twice my car got stuck in first gear when going on an incline drove the car for awhile it happened turned the car off restarted and it was fine what can that be?

Asked by for the 2006 Mercedes-Benz CLK500
make sure you check you transmission.. i have a CLK500 with 30k miles and it would go into gear and just rev. the 7speed tranny up and through 2008 or so has a bad seal and the torque converter spins so fast it melts to the seal and blows the pumps etc. take it in to be looked at before you cause more damage.
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you can also check the transmission fluid
if there is not enough transmission fluid or if the fluid is old then that will defect the shifting gears