Some tips for improving WiFi performance;
There are other options. Google for WiFi repeaters / range extenders, WiFi mesh systems / pods.
I find it odd as I am been running 5 and 2.4G without issue for years. Now I see all these posts about disabling 5G. My Roku2 just 2 days ago would fail internet connection though connected. It plug a wire into it. Just seems odd people are experiencing issues these past few months. At least that is my observation.