So I've posted this in a few threads but wanted to call special attention to this problem since my brand new 100% stock replacement SP2 is experiencing the same problem and it was suggested this may be a universal (all SP2s) problem Frequently, my SP2 with nothing running will idle with 3 core-processes using up 30% of my CPU. This causes the device to get hot and experience battery drain when nothing is running. I've spoken to support whose reasoning as to why I should not request another replacement was as follows: This is your second SP2 which still experiences the same problem so please wait for MS to release a patch for this known issue. This leads me to believe that if the support rep has concluded that a further replacement will not fix the issue that this issue is more widespread, perhaps universal to all SP2s. Windows Update shows that it did grab the 1/18/2014 System Firmware Update btw. I do know that this issue may be due to the Realtek audio drivers and can be remedied by disabling it in Device Manager (not ideal, as you will not have sound) People tend to think this is related to SD cards installed but this is not the case as I get this issue with/without my SD card installed. So I ask the community here and those experiencing less than ideal battery life to open up task manger when your device is seemingly running warm for no reason and see if System and System Interrupts are chugging away for no apparent reason, thanks.