Network is a problem. As I understand it, the ME subsystem is an overseer, and is running even if your main PC is powered off. It has control over the network,

Network is a problem. As I understand it, the ME subsystem is an overseer, and is running even if your main PC is powered off. It has control over the network, unobservable from the downstream CPU/OS. It could therefore receive commands/input from the network and update itself while "off", or transmit data outbound. So unless the system is unplugged from the wall, the ME subsystem could be doing God-knows-what.