By the information you provided there. It seems that there is a issue with the cable and there is too much interference on the cable.
The signal to interference is sitting too low at 33. It must be at least 34 or higher for you to have a stable connection.
Given the current issue with Covid19, I am not entirely sure how high priority this would be as work is cut down to "essential work only"
If you could contact Virgin on their texting service (07533051809), provide account information and what I have mentioned here, I hope they can sort this issue out as quick as possible. However, responses may be delayed due to high demand and low staff.
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I am a Service Field Technician at Virgin. However, all responses on here are based on my experiences in the field alone and my own equipment at home and should be taken as such
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