I apologize for the not using the normal guidelines, but I have no idea how to reproduce this reliably.
When entering Groddle Forest or Shimla Mirch streets with other people on them, during high-traffic hours, I will often wind up trapped in an endless loop of lag, errors, and connection resets. It seems fairly random, but I have noticed that it's most common on streets that see a lot of traffic.
The first symptom is the loud SFX of people zoning in and out while I'm loading in. I will get bombarded with 8-10 "<playername> has entered" "<playername> has left" messages once loading completes. Then a massive lagspike hits as the game tries to play catch-up. Then I get a connection reset, an error dialogue box, and the game automatically reloads the zone. This causes another lagspike, which eventually leads to another connection reset and reload.
This repeats ad nauseum until I either wind up disconnected completely or my browser itself crashes. Strangely, it only seems to happen in Groddle Forest, Shimla Mirch, and the busiest sections of Groddle Heights (such as Alpine Heights and Bishop's Arch). Groddle Meadow and most of Groddle Heights is fine, and Ix is suprisingly lag-free and silky-smooth compared to most zones.
I have tried reloading - my browser and computer are simply so overloaded that Opera simply won't respond to the reload page command. Clearing the cache doesn't seem to help either. I suspect server load or recent changes has something to do with it. I wasn't experiencing this problem last night, but there were much, much fewer people on then.