I've seen this issue posted all over the forums... here's what I've noticed: 
 
When my server is having severe lag, it's almost as if the server doesn't load a dynamic zone quick enough for the client. The client gives up waiting and drops the connection. 
 
The only fix I've seen is to have servers with statically-loaded zones. This is a killer on resource though, especially if you're using a large database and map files. 
 
If you're an admin, you can try #zonestatus to see what zones are up, and then #zonebootup <zone server ID from #zonestatus> <zonename> to boot the zone before you go into it. I'd give it about 5 or 10 seconds before you zone in. 
		
	
		
		
		
		
		
		
		
		
		
	
		
		
	
	
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