I think this issue has resolved. Tested late last nite, able to login xbox live and access dashboard as usual. Can anyone else confirm. I think it has been resolve at server side.
Or u could try
[quote user=" Phixb360"]
fix it by using below method, it work with my freezing in logging to dashboard with my account.
1) Power on xbox 360 and skip login to go offline mode. While in offline mode, place in game disc and startup your game. When in game , press the silver button to bring up the guide menu. It will have no problem login your account to xbox live.
2) While your account is connected to xbox live successfuly and xbox guide menu is still open, hold the right trigger (RT) and press Y button to refresh the xbox home dashboard menu.
3) Shut down and reboot
4) Try login to xbox live again but this time in the main menu and see whether it work.
[/quote]