WiFi is slow in the house

[Rory99]

I have just installed the white sky WiFi hub but even for the past 5 ish days the WiFi has been incredibly slow and inconsistent this shouldn't be happening anymore, I have ran countless test and tell me everything is fine however this isn't the case I need help ASAP, usually the WiFi is okay and has been the case for the past few months but suddenly it has been awful and I have no idea why