Samsung Galaxy S4 Wi-Fi - Terrible Link Speed

[AC Question]

Hello! Having some very weird issues here with a hand-me-down GS4 here. I can connect to the wifi network with Good-Strong signal strength no problem, and immediately when I join I get a link speed of 72 mbps. After 30 seconds this quickly drops 5-6 mbps, and appears to stay that way. Coming right up close to the router boosts this up to 20 mbps and appears to work fine. The thing is though, I had the GS3 previously and never experienced such an issue from the same distance from the router. I have a BT Home Hub 5, just for reference.
I have tried switching channels on my routers settings, based on readings from the wifi analyzer app and have tried connecting to both the 2.4Ghz/5Ghz Variants of the hub. I have also turned off wifi power save with the *#0011~ call. All to no effect.
Please help!!!
Thanks,
Mercer

 

[B. Diddy]

Welcome to Android Central! Does the router have a QoS setting (Quality of Service)? You'll have to log into the router's settings webpage using your desktop browser -- see the router manual to learn how.

 

[Mercer Hughes]

BT Hubs do not have Qos unfortunately. Any other ideas?

 

[B. Diddy]

How many other devices are connected to the router? What if you turn all of their wi-fi radios off as a test?

Thanks for registering -- when you get a chance, head over to the Introductions forum and tell us something about yourself! http://forums.androidcentral.com/introductions/