Looks like a noise problem on lower frequency channels, upstream isn't in full health either. I've flagged for the staff to advise, good chance you'll need a technician, if that is the case they can get that arranged.
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Update: An engineer visited Monday morning and the outcome is that a new router is needed apparently. I was told that a replacement would be sent within 48 hours. It is now Friday pm and no router has been delivered so far. Is one going to be sent or not? Has this even been acted upon I wonder. I hope the Virgin Media adviser who posted previously will advise what is happening. This is still unresolved.