I have an Aironet 350 non-root bridge that was reset back to its factory default configuration over a 5 day period of inactivity (Christmas vacation). I didn't set it up, so I can't say too much about how it was configured before except that it was running 12.0 firmware.
I have upgraded it to 12.04 and reconfigured it and it seems to be running fine.
Any ideas on what could have caused this? Could I have had a security breach?