okoye11 The Premiere is 2.4GHz only WiFi. You are likely encountering interference on the 2.4 GHz band, which is far more crowded than 5 GHz.
Before replacing your Premiere with a player that supports 5 GHz, you can try a couple of things first. The first is to change the channel your WiFi radio uses. While there are 11 channels available, only three do not overlap each other. So channel 1, 6 or 11 are the best to use. If you have a laptop handy, you can download a WiFi scanner program and see what channel might be the best choice for you. Otherwise, just experiment. You can see what channel you're using right now in the Roku Settings/Network menu. Your router is likely set to Auto for channel selection, and while they usually choose a good channel, sometimes they get it wrong.
The next thing to try is simple: just move the Roku to a different location. At the frequencies used by WiFi, sometimes only moving a device a matter of inches will completely change the connection quality. It all depends on what might be interfering with the signal. So experiment with different locations within the length of your HDMI cable.
If you decide to replace the Premiere with something that supports 5 GHz, you need an Ultra, Stick, or Express 4K (not the basic Express). Those are the only three players that have dual band WiFi in the current models. There's also the Streaming Soundbars, but I don't think that's what you were thinking of.
