Mine has been acting up too. Sometimes the seat won't go back upon exit and won't come forward and pressing the memory buttons does nothing. Other times it works just fine. Code comes up B2375 5A and B2375 06 which is for the Horizontal Position Sensor for the left seat. Last time I looked, that was part of the Memory Seat Module (MSM) (don't remember for sure) and that thing is embedded inside the driver's seat. Needless to say with summer here, I'm not touching it until the weather cools.
Manual controls work and we tested the connector and it was fine as well. I wonder if the movement or people's feet causes a loose connection?