What that guy said...
I have the BEFSR41 and I know there is a reset button for this very thing. It should work no matter what firmware you have but if you flash to the latest firmware that may clear it.
BTW : Not sure if you are aware or not, but there is a newer firmware out. We are now on version 1.05.00. Assuming you have a version 3 router I would suggest you flash to the latest firmware found here
Full list of bug fixes in the new firmware can be read here