When you tap the "window down" button up on the header bar, it's supposed to lower both rear windows and then immediately lower both front windows.

For the first three years / 50k miles, that's exactly how mine behaved. But in the last 20k miles, sometimes the rear windows will go down immediately, but the front windows won't do anything for 10-20 seconds, then they'll both go down as normal.

Has this happened to anyone else?

 

Not yet... at least not the last time I lowered the top. Maybe 50k is the magic number.

Mine is '06 as well.