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Sudden slow wifi download

First Timer

Can anyone solve my conundrum I have a Dell laptop which until 10 days ago downloaded on wifi speed test at around 40Mbps, now suddenly it only downloads at 4Mbps. If connected via ethernet it downloads at 78Mbps (I have super fast broadband) Its wifi upload speed is still fine 19Mbps.

Router set to 2.4GHz only. All my other devices iPhone iPad etc, still wifi download at > 40Mbps. I have disabled the network card, and installed a USB wifi adaptor, no improvement. I have rebooted and updated both the Taltalk (Huwei) VDSL router and the Win 10 laptop (it is stuck on ver 1803). I have changed wifi channels and SSID, to no avail, yet If I take it to a friends house it immediately wifi downloads at over 40Mbps again, suggesting it must be my router wifi.

So I have connected another router via ethernet to the VDSL on a totally different gateway, and set up a wifi channel on the new router that only the laptop is set up to communicate with, very  slight improvement now 6Mbps download but still  19Mbps upload, but still nowhere near 40Mbps download that it used to be. If laptop ethernet connected to the new router 78Mbps OK.

All tests done alongside the router. Have used, Which speed test, BT speed test, TT speed test, all give the same answers. Have checked data rates up and down to webspace via ftp, download only about 20% as fast as upload.

I have run out of ideas. Do you have any?

Community Star

Hi Jseltt, welcome to the community your post has been flagged for assistance and you should hear during the day in the meantime please check your community profile and add your landline phone number if necessary it is used to identify your account.

Have you tried enabling 5ghz with a different SSID name?

Any new electronic kit arrived in the house recently?

I don't work here and all my opinions are my own.
Community Team - TT Staff

Hi jseltt


I'm sorry to hear this.


@KeithFrench provides really good advice on improving wireless performance. Could you help please Keith?





Community Star

Hi @jseltt 


Debbie has asked me to help you. You say you have the Huawei router, I assume that this is the HG633 & not the HG635?


Slow speed, intermittent dropouts, breaks in the signal, or no signal on some or all devices, might be caused by Wi-Fi interference from other local networks, which can also lead to a permanent reduction in speed. No ISP can be responsible for your local environment, this is mainly a by-product of the popularity of Wi-Fi.

However, other factors should be investigated first. When this happens, what are the lights showing on the front of the router? Do you have any wired connections & if so, how do they perform?

The HG633 is a dual-band router & offers both the older 2.4GHz & the newer 5GHz Wi-Fi bands. The problem is these are two different networks (SSIDs), but they share the same name, so you can't tell which one you are connected to. Log into the router ( and enter a username of "admin" and use the unique router password (see the label on the rear of the router at the top).

Go to:-
"Customise my wireless network"

Append "5G" to the end of the network name of the "Wireless 5 GHz SSID" field. Then click "Save".

This will not fix your issues, but it will make it much easier to identify the band you are connected to. This way you will know which band is causing your problems.

Having said that, there is another approach which can be better, which is to use Band Steering. This will automatically move any 5G compatible device connected to the 2.4G band to the 5GHz band. This is available on the HG633 (V2.00), to enable it, first set both SSIDs to the exact same name. Then go to:-

Home Network > Wireless Settings > Enable Wireless Network Frequency Bands


Then put a tick against Enable Band steering.

Generally speaking, the 2.4GHz band suffers much more from interference than the 5GHz band, but the 2.4GHz one can sometimes have a better range, but this all depends on your local area.

You may then wonder what was really the point of this if it won't solve the problem? This is because the whole topic is too complex to be dealt with in one post. The next stage involves sending out a guide to you to help you get me some important diagnostic results, so as I can analyse them for you and recommend changes to your router configuration to solve them.

I only send this out to people who request it.


I am not employed by TalkTalk, I'm just a customer. If my post has fixed the issue, please mark it as the Best Answer.
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Community Team - TT Staff

Hi jseltt


How are you getting on?