Mini box losing connection

[dave4321]

Hi. I have a sky q box with no issues. Using sky broadband with a speed of 73mps. We have a tv in our summerhouse so I got a mini box but it wouldn't connect. So I purchased a tp-link extender. Plugged into socket inside with ethernet cable into router. Plugged other connector into socket in summerhouse with ethernet cable into mini box. Worked for a while but lately cannot watch tv, constantly freezing. Any ideas please? Thanks