I have the same problem as Gavin on my aa1 which also has is the AR5001. Only problem I have is that after it loses its connection it is unable to connect anymore. It is as if you use the enable/disable switch on the enclosure to switch off wireless and after that it wont respond to enabling it again. As a workaround i reboot in windows that enables the wireless again and after that reboot back to lucid. So it looks to me that the controller goes into a sleep-mode and that the driver is unable to wake it up again.
I have the same problem as Gavin on my aa1 which also has is the AR5001. Only problem I have is that after it loses its connection it is unable to connect anymore. It is as if you use the enable/disable switch on the enclosure to switch off wireless and after that it wont respond to enabling it again. As a workaround i reboot in windows that enables the wireless again and after that reboot back to lucid. So it looks to me that the controller goes into a sleep-mode and that the driver is unable to wake it up again.