I've noticed that I rarely, if ever, get discoed from MA play, yet get discoed far more frequently in the Special Events Arena. It seems that it's an issue with that arena specifically, or just an issue with having many many other players within a small area of map (as is unique to Special Events).
Could someone with knowledge of AH's netcode explain why this may be the case? I'm running Windows Vista (ugh), and this has occured while using both using my wireless card, and while physically plugged in. I'm going to try turning off all AntiVirus next time. Any other suggestions?