I just want to add that I appreciate Joerg's persistence in the face of this problem. I don't consider it a waste of time. And it isn't always a simple matter of replacing equipment. In my own case I recommended a pair of these WAP121s for a client a...
You have come to the same conclusion I did (see my post from Jun 23, 2012 3:28 PM in response to zacmutrux). However, running an 802.11n access point in 802.11g mode is not an acceptable workaround. Joerg Bachmayr has made a heroic effort to resolve ...
The WAP121 units I reported are behind a Cisco ASA 5505 (ASA Version 8.4(3)) connected to the PoE ports ( Ethernet 0/6 - 7) and the ASA 5505 is in turn connected to a Comcast-provided Arris TM502G on its Ethernet 0/0 port.