Are you running wireless security? I had one time with my linksys router wrt600n with the org firmware if i would run wpa-tkip i wouldn't get much throughput to my wireless devices and when i change over to aes it was like I put a Blower on a BigBlock! I know this shouldnt even have happened, but i did verify it at the time. All I can attribute it too is a bug in the firmware... Now I don't have that issue after upgrading the firmware... but at that time when i was having a similar issue I drove me bonkers....Won't hurt too Look.