Losing connection all the time

[WindyWeather]

I have a SkyQ box, but recently bought a skyQ mini box for up the shed, which is connected to our box at the house using Cat7 ethernet lead.  For some strange reason everything I was previously connected at the main house wanted to connect to the shed, so I had to reset everything and change the password to the SkyQ mini box inclucing PC, phones, TVs, Tab, Alexas etc.  Everything has been working great this last week, except now I keep losing connection and I'm not sure why.  I don't know if it's because we've put this mini box in, or there is a problem with our broadband connection