Odytzi

I have another problem,when i reach a population over 300,000 on one of my cities,then at a random time of my game the sound stucks and I hear the same sound.After that when i quit the game it never sychronize and keep saying ''wait for syc with servers'',or sth like that and application don't respond-i need to alt-control-del to close the application.(the game is not saved).The next time i join the game city loads normally but at a previous savegame and continue to play normally...