We're aware that some players have been experiencing intermittent disconnects while playing the Diablo III beta and are looking into those issues currently. While we don't have an ETA for when server connectivity will be restored, we'll be providing updates in this thread as they become available.
We apologize for any inconvenience these issues may cause and thank you for your patience while we work to resolve them. We'll get you back to your regularly-scheduled hacking and slashing as soon as possible. :)