3 telltale signs someone is stealing your Wi-Fi - and how to stop them

Follow ZDNET: Add us as a preferred source on Google. Wi-Fi slowing down, or unfamiliar devices on your network? You may have an intruder. There are various ways to quietly confirm your suspicions. Here's how to verify whether someone is using your Wi-F, and how to stop it. Surveillance continues creeping into our daily lives. Facial recognition cameras litter the streets; we are constantly monitored online, and it's rare to attend a social event without a camera being waved in our faces. However, the prospect of such surveillance entering our homes can be even more disturbing. Have you ever noticed an unfamiliar device connecting to your home network? Or is your bandwidth decreasing rapidly? If someone is lurking on your Wi-Fi, that's a serious invasion of your privacy, not to mention unfair, as you are paying for a service. If someone gains access to your Wi-Fi, they can do more than just steal the bandwidth you're paying for;…