Few devices cannot see my WiFi

[Aneta5]

Hi, 

I have problem with router for a long time. I have to reset it often as speed from my router to devices is poor 27-34 dawnload (should be around 50). Restart usually helps. I had enginer recently and he said line is OK but is something wrong with router.

From few days I started to have problem with my phone (was OK earlier). I can't connect to WiFi. My phone see many other networks but not ours. I tried add new network and put details manually but still nothing.

From yesterday two more devices cannot see our network (they worked ok earlier). I tried everything, even put my phone to factory settings but still nothing.

I definitely need a new router but talk talk said router works fine... 

[Michelle-TalkTalk]

Morning,

How are you getting on?

Thanks

[KeithFrench]

Slow speed, intermittent dropouts, breaks in the signal, no signal on some or all devices or no internet access 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 byproduct 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?

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.

If you would like me to help you, please can you specify the make/model of TalkTalk router that you are using?