Here's a possible workaround for those of you experiencing Disconnections. Try this:
1. Right click the launcher, select properties, and then the compatibility tab.
2. Make sure 'run this in compatibility mode for: Windows XP (service pack 3)' is selected and 'Run as Administrator' is selected.
3. Select the Shortcut Tab, then select Advanced. Make sure it's set to 'Run as Administrator' then hit Ok.
4. Once you've done that, verify your client, then try running it again.
This has helped a few people with disconnection issues. It may help you too.