Garratt problem with my devices low signal strength

[Anonymous]

My signal strength is low on my devices and I am on the 900 top srength I keep getting these issues 

I need to know if anyone as been logging into my WiFi without my consent as I've had many issues in this area 

your help would be greatly appreciated

[MissF]

Check your the connected devices on the sky app, it might help if a device you don't recognise is on there