I'm a new Mac user, having switched from Windows. I have an iMac and a MacBook Air that are connected to my wifi network. The MacBook Air needs to be manually connected each time on restart. I ran wireless diagnostics, and was puzzled by the attached item. There is indeed a network nearly with the name "Direct-Roku-164." What does this mean and how can I prevent its interfering with my network and connections? My router is an Asus RT-AC68U, and it's set to choose a channel automatically. Both devices are on my 5GHz band. Thanks.

