Linksys WAP54G - failing on chan 9/10/11

Had weirdest thing happen today...
Running a Linksys WAP54G - version 3.1 - firmware 3.04

Came home and the WiFi in the house was "not working".
Did some tests, and yup - nothing was associated with the WAP.

OK - did some banging around,
and after doing a "factory defaults" the WAP was working again.
Hmmm... started changing things one item at a time,
and discovered that when I got up to channel 10 or 11
(was config'd for channel 11)
then the WiFi devices would not connect to the AP.

Have you ever seen this -
where the RF section degrades
or something happens at the high freq end,
such that channel 9,10,11 are not working right ?

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"If everything seems to be going well,
you have obviously overlooked something." - Steven Wright