A spring clean up around your satellite dish can help detect any loose fittings or debris that can cause reception issues, 

Even if there's no interruption at the moment anything that is loose like the fittings of the dish can cause the signal to drop off or over time reduce the satellite strength needed to deliver the Freeview Channels.

Make sure cables coming from the Satellite Dish to your receiver or TV are tidy and tied away so they don't over hang also check for any sudden creases or dents in the cable.