Hi All I am having same problems. Phone hot and battery being drained even when unused. Have followed as much advice as possible from above. Main thing draining mine seems to be the google calendar sync. Even when idle I am using 474MB of the 831 available. When I click 'clear memory' it closes 23 applications and drops the usage to 384 but then it creeps up again. I am struggling to get the battery to even last a couple of hours!!! Any news of an update/fix or am I scratching around for a solution. Many thanks in advance.