Failed to enter the room? Yup.
Rooms that obviously aren't full nor friend passed saying that they are full? Yup.
Generally poor connections from an otherwise fine line, that doesn't affect any other online game? That too...
UPnP is disabled, NAT Type is 2, and everything else works just fine. Firmware for router is the latest, as well...
Heh I do hope aksys patches this. The 1.01 patch might have resolved most users, but it wasn't a final solution.