'06 Odyssey - sonic "thumping" with sliding door windows down
 

When driving at highway speeds, our '06 Odyssey produces a wierd sonic
"thumping" sensation when the sliding door windows down (even just
partly, in my experience) while the drv/pass windows are up? Lowering
the front windows or raising the sliding door windows makes the
thumping go stop. Anyone else notice this?