WiFi struggling to connect, when connected there is no internet

[Ed011]

My phone typically connects fine, whereas most other devices (partners phone, our laptops and TVs) really struggle to connect to the WiFi. We have removed every other device from the WiFi's history but that didn't help. 
Despite this, when we finally connect, the wifi is "Not Connected" or has "No Internet Connection". 
Service used to be good, only happened over the past week or two - no records of problems in our area according to Sky's website. 

[Addie15]

Hi there, @Ed011. I’ve escalated your post to our Community Messaging team who will invite you to a private chat shortly and help you with this. 

Just look out for the colourful bubble to start the conversation.

Here's more information on how Community Messaging works - https://helpforum.sky.com/t5/Did-you-know/Escalating-a-post-to-a-Sky-expert/ba-p/3711147