I have a problem on my AIR-AP1121G accesspoints. Sometimes they cannon be access via telnet, it works fine after a reload. This happens not very often, but when it happens, I need to reload it manually.
I'm using a backup tool, for backing up the running configs. Last report I got from an unavailable AP was that the line config for both console and VTY was missing. I think this is the case on the other APs as well. But why the backup could be done I don't know, the backup rutine is done via telnet.
Using this software: Cisco IOS Software, C1100 Software (C1100-K9W7-M), Version 12.3(8)JEC1, RELEASE SOFTWARE (fc4)
By the way I've read this thread but I'm already using the exec timeout option on all of the lines.