When you get disconnected by another login... you get a msg that says someone logged in..and that you need to make sure your account info is safe... i got that msg when i split from trying to use Chrome only on 5 servers (Beta,1,2,3,4) i left 3 on chrome and put 2 on Opera .. i had left 1 of them on chrome just cuz i was lazy but when it logged in opera it told me on the chrome window to check to make sure my info was safe...

Thats different than regular disconnect or the disconnect because of out of sync

i agree with Boro .. you should reboot your modem or check a differnt browser.. or change proxie's be best if you didt have a proxie.. and/or stress test your internet connection to make sure its not dropping packets..