How is your battery exactly? At first, mine drained also very fast... but I also had problems with my contacts setup, which all of a sudden didn't work anymore... I did a hard-reset ("Clear device") and now everything is fine. With good use, battery seems now to last about 1,5 - 2 days and idling around this night it only lost 3% of battery (idle for 9h with WLAN active and doing automatic Facebook & Twitter updates all night).