Welcome to the forum. Have a look at the following thread to read what other people have tried and if you have no luck try replying to that thread as you may get some replies
Going into your router settings and setting the 2.4GHz wifi band to 50% power may be one possible solution.
Im the same. It’s been this way for about a month and it’s driving me bananas. They sent me a new box but the same thing is happening. I will try and run through these solutions on the thread above.
Read this link below, which should explain how to reduce the WiFi power to 50% on a TalkTalk router.