Whenever i click the ranked tab, client starts freezing and it becomes totally unresponsive after 5-10 seconds and then it generates a bug splat notification. The client then restarts on its own, with the account being logged in and in lobby as before. Only that it becomes extremely glitchy with half the menus disappearing.
The only way to fix it is by manually restarting it. On the other hand, the problem still remains with the ranked tab being "inaccessible".