EA booted you because you were on for 4 hours.
Dunno about that. Once I've finally gotten connected to a server and successfully loaded a region and a city I've had no issues playing for 6-10 hours straight on launch night and last night (couldn't get connected at all on Wednesday night).
I'm having similar issues w/ intra-region play on a private and entirely single player region though. Utilities trading seems to be completely broken, which given the initimate confines of each individual "city" map makes the game pretty shallow. In the region I started playing last night (the Archipelago one) I've got two cities right next to each other, one intended to be a residential/commercial center and the other heavy into coal mining, industrial, and utilities. Despite having 10x the need in surplus of each utility it still shows as no resource available when attempting to sell/buy any utilities from the region map w/ either the industry/utility city or neighboring residential/commercial city loaded.
I'm actually pretty eager to explore the more interconencted gameplay approach but w/o trading/commuting working between the "cities" it's pretty much a non-starter...