Pardon my double post, but I notice a lot more recent activity on this thread.
I'm at work and just upgraded my laptop install. Patch notes say:
- World of Warcraft Client Patch 2.1.2
...
- Players will no longer slow down to walking speed when closely
following another player.
I won't be able to test this out for about eight hours. If anyone can experiment with the new patch and post results, I'd love to hear if disconnects have stopped.