Two related things-that-should-not-be-related bugs that I have encountered:
The WiFi on my girlfriend's laptop would fail when an HDMI cable was plugged into the laptop. Changing the channel on the router "fixed" it but we never could figure out the ultimate cause.
I can pause my Roku box using the Kodi remote app on my phone. This occurred when I inadvertently used the wrong remote to pause the Roku. It appears only to work if the Raspberry Pi running Kodi has gone into some sort of standby mode, possibly making the Kodi remote app send a wake signal which is interpreted by Roku as the pause signal.