Wifi speeds

Everyday it seems I cannot load anything on mobile. I test speeds and am getting no connect too ookla when I am standing over my modem. It is not until I go to test connection in the Xfinity app and am told connections are great are the speeds back to normal. This should not be a thing. The money and time spent with Xfinity this is absolutely a data sourced thing. Zero reason this many people should have the same problem and this happen every day.