My bmw transmission is slipping.?

i have a 1997 BMW 328I AND WHEN I STOP FOR A RED LIGHT THEN BEGIN AGAIN IS JERKS. IT SEEMS TO DO IT A LOT. IM CONVINCED THE TRANSMISSION IS GOING TO GO, BUT BMW'S HAVE SEALS TRANSMISSIONS, THEREFORE MAYBE THE FLUID HAS NEVER BEEN CHANGED OR MAYBE IT LEAKED. PLEASE HELP ASAP
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