I'm using DMZ, SPI and UPnP but I've also tried disabling them for diagnostic purposes. But all that accomplishes is that the throughput loss takes a bit longer. So instead of going from 100Mbit to 40-45Mbit in like 10mins, it takes about 30 mins. QoS is disabled so that's not the issue here and i'm using firmware 2.00_patch03. But i had the same problem with the original firmware (1.0) (which was the reason i upgraded to 2.0_patch03 in the first place)
Anyone with some suggestions on what to do next?
Edit: forgot to mention that throughput never gets below 40Mbit for some reason.