I have a Linksys WAP11 v2.2 with the latest firmware.
I can get a solid connection (excellent strength and quality) but it will only reply to a ping over wireless for about 5 seconds after it boots, after that it stops respondig.
It responds fine over ethernet via a hub. I can get in and configure it over ethernet.
I can go in and just re "apply" the existing settings in the web interface to get it to reboot and I'll be able to ping for 5 seconds and then nothing.
I just added a Bridge on Channel 5 that it connect to. The AP is on Channel 11 (though I've tried 1,2,3,8,9,10,11 with no cure).
At first I couldn't get a solid RF connection, but then cranked the Beacon Interval down to 25ms from 100ms and it stays stable now.
It's not a duplicate IP. I assign the IP statically because DHCP doesn't respond at all.