try and relog, if that doesnt work reboot PC and net connection.
otherwise it could be a server issue.
i was getting a ping of 4000, i rebooted and delete some nasty process call 'svmscv' and 'rlkvnk' or something from my task manager and it sorted it out.
hit ALT, CTRL, and DEL at the same time from your desktop and see what your computer usage shows as. with no problems it should flick between 0-2%. anything over 10% when not running anything sugggests foul play. run a virus and spyware check.
also make a list of the processes in task manager, and see if any new or dirty looking ones pop up. if so, right click and end process tree.