A Roku 3 or streaming stick uses Wifi Direct to communicate with the remote control. This works well… unless you intended to use your wifi for some other purpose, that is. If your Roku is near your wifi access point or between your device and the access point, you’ll experience horrible wifi connectivity. A Roku in the apartment next to you could break your wifi connectivity. People have been forced to stop using them in condos due to neighbor complaints.
Well, I’ve found the problem and how to fix it.http://www.netconsonance.com/2016/06/how-to-prevent-roku-wifi-direct-breaking-5ghz/. Comments are welcome here or there as you please.