Need some help BT Internet

[Fringe]

Good Evening People , Having a small issue currently have BT Internet with BT Tv Box for sport but have Sky TV as well . The BT Tv Box is connected via Ethernet but when its on the WIFI drops out upstairs to other TVs and Sky Q Multi Box and to mobile phones.

Any Ideas for anything i can try?

Thanks

 

[bremen1874]

Previously worked and has just started playing up, or broken from day one?

 

[Fringe]

Worked fine before just started maybe a few weeks ago