Getting some lag and login issues.
Did they fix the update client issue as this causes login issues.
Have they split the game server/ login server / db server location or done an all in one?
Which tier of AWS EC2 did SDE sign up for..? there are 9 tiers in that data centre for dedicated...
Which type of hosting are you using On-demand, Spot, Dedicated or Reserved?
Each have tier and hosting level have performance charastics that can effect end user experiance.
Without seeing the instance ASW performance and network metrics I think the instance may have issues with either undersized, unreserved or the network route.
Happy to help SDE with this they have my contact details and hourly rates.
:-)