I have a b6 s4 tip and within the last few days the transmission has started shifting rough. I first noticed this as mild between 1st and 2nd, but now it's spread to all shifts and delivers a noticible jolt on kick down. I'm wondering if this means I need to change the fluid or if a rebuild is on the horizon. I bought it with 95k and now have 110k. It supposedly had just received full service prior to purchase.