@rileelol
What is the Roku device? Model number and Roku software version/build.
Settings > System > About
I'm going to take a guess that you have a Roku Express, which is 2.4 GHz band only. I'm also going to guess that you have Comcast, Spectrum, or another ISP that's been changing 2.4 GHz settings from b/g/n to g/n. But only your Roku model number will confirm that.
DBDukes
Roku Community Streaming Expert
Note: I am not a Roku employee.
If this post solves your problem please help others find this answer and click "Accept as Solution."