Transmission question .

I have a 94 FWD SVX, and since I bought it, it was running great. The tranny was shiffting very smooth. Couldn't even tell when it shifted. Anyway, last night I got on the expressway, everything was cool, then I cought some traffic and had to stop. When I started moving again, and the car shifted into second, it sort of jerked the car a little. I didn't pay any attention to it, util it started doing it at every shift. Any ideas? Thanks.