Examining the logs of your router it seems to me that it is more router specific issue encountered by others and I found some references googling around on possible ways to cure the problem. I am not sure it will help but please have a look at:
http://forums.dlink.com/index.php?topic=39174.0
http://forums.dlink.com/index.php?topic=39174.15
Now concerning this one:
let's try this blind fix: can you please test (again...) this firmware:
http://update.archos.com/9/gen9/gen9_4.0.6-TEST2/firmware_archos_it4.aos