Just wanted to share on this thread that I identified an issue with my SP3 i7, 256 today where Windows Defender idle processes were causing my CPU to contantly run at 35% usage and around 3.0 ghz processor which was causing the unit to constantly be hot and the fan to run in idle status. This would happen indefinitely until you moved the cursor or touched the screen or keyboard. I posted another thread about it, but thought it was good to note here. Once I disabled Windows Defender and installed a new AV protector, the unit has set quiet and cool. It still gets warm during installations and truly cpu intensive stuff, but not when sitting idle.