"The problem was temporarily fixed on the morning of Saturday 29/12/18, but it resurfaced again the same day, around 3:30pm."
Indeed. See above. I've reported it to VM; and told the tech who came yesterday. Every time I've been ignored. When I phoned this morning I was told yet again that there were no known network issues. This time I was told (by a supervisor after the first tier could not understand the difference between "packet loss" and a "lost connection") that it might be another device connected to my hub not behaving properly and asked to disconnect them and monitor what happens over the next day or 2. I shall of course do so - despite the problem persisting when all devices were powered down. But I lose faith when CS aren't even aware that a network issue has been acknowledged and fixed.