@Kirstin77 Is there anything specific you see when the connection is lost, take a look at the link below and say if so from it!
This link below provides information about the coloured lights on the various hubs that can help to see what is going on! If the system is also Full Fibre then the lights on the OR/CF ONT also require to be looked at! https://www.sky.com/help/articles/hub-lights-explained-start
