Map Crash and Rollback.

I keep getting odd spikes when playing my lich and heavy aoe is going on. It locks up and sometimes disconnects me from the server. After reconnecting I have lost my map and any loot i might have picked up before the disconnect. My internet is stable during these instances so I'm fairly sure it isn't on my end. I've tried switching from the CA server to the Washington one and I've had the problem on both. The texas server has never worked for me.