TL- PA7017 Kit 

AV1000

just purchased from Argos and plugged one into sky router 900mb fibre to property 

and plugged other in upstairs. 
 

1. it will pair and all 3 lights go on but the connection is terrible. Better on WiFi. 
2. If you plug anything else in another plug in the same room example computer monitor or PlayStation - the middle internet light goes out. 
 

Have you got any suggestions to help or do I need to return for something else. 
 

I didn't want a WiFi's extender as sky said than mess with your mesh with all the sky mini boxes. 
Just need one Ethernet port upstairs for a computer that is for gaming and doesn't not have Wi-Fi 

thank you 

I am not very technical but can get by with step by step guidance.