Yes it very well could be the module under the seat, I was just trying to figure out and therebye eliminate the potential apparent cause and effect I'd thought you'd described.

As far as the passenger door relating to the driver's seat's movements, the only correlation I can figure has to do with the way the seats are adjustable without the key in the ignition only when the door is open. So if there is a problem with say the open/short wiring on the driver's side door there would only be power to the seats with the key out of the ignition when a door is open. In effect the opening of the door acts as a power switch, then the seat moves because it has both a control issue but only has power when the ignition is turned or when the door is open.

It sounds like you have disassembled and cleaned the seat switch and you are certain that the memory switches (A&B) are functioning properly, they make contact only when pressed and break contact when released. One way of dianosing the potential of a switch or switch wiring problem would be to disconnect the wiring control plug under the seat, open the connector, identify the two A&B switch wires, remove them from the connector(noting their position and insulating them) then replug the connector to the module. Then you should not have any chance of errant control signals to the module, open the passenger door, the lack of the seat movement that you had previously observed would point to a control issue. If you still have the seat moving at unexpected times it would point to a problem with the module itself.