Hi all, just picked up my Surface Book i7 from John Lewis, having had an SP4 i7 previously, and am blown away with how good it is. However I'm noticing some white noise coming from through headphones. It doesn't affect the speakers, and it happens as soon as the computer outputs any sound (system sound, music, movie etc). It goes a couple of secs after no more sound is being generated, probably the sound card shutting down to save power. I've read that Paul Thurrott had a similar problem as did others with some early units which seemed to be hardware related. I've tried uninstalling the Realtek driver and updating to latest, no improvement. All latest firmware installed too. Has anyone else had a similar problem with latest units?