That's interesting as quite a few comments out there about the supplied vodaphone router being poor. However, maybe the setting change you will try might be the solution?
Anyone got experience of vodaphone broadband? As I have currently have SIM only mobile deal they are offering Superfast 2 broadband (63mps) deal for £21 a month. Obviously actual speed will depend on my location and located BT wiring set up.
A quick check on Google suggests some issues and...