Loose front seat

Car is a '99 A6 Q with power seats. lately the bottom part of the seat started to tilt about 1/4" front and back (rotating to the front when
braking and back when accelerating; very annoying). Any pointers before trying to fix it this w/e. is it a simple wrench job or do I need to take the seat out. BTW the power function works fine in all directions.
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