Keep pressing the button until the window gets down to the bottom and press and hold the button for 3 seconds. Then keep pressing the button until the window gets up to the top and press and hold the button for 3 seconds. That will recalibrate it so that it works properly again.
See:
http://www.youtube.com/watch?v=mN3XSwooxOM
ChicksFan
April 2013
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