Hmm,

When I was playing on a Wireless the Whole Internet went dead when I was in the BoT towers on a raid. If I was just playing in Plane of Storms I didn't LD.
I didn't have to reboot, but I had to wait a few minutes before I could browse the web.

But try the serverfilter and datarate, that might just push you under the threshold.

Also if you are using a Linksys router, there was a software version that LD'd after a large packet exchange. See if that's your brand.