Hubs do go wrong from time to time, as do PSU's, but they go wrong far less often than DOCSIS connections throws up noise problems, so even if you get a new hub and a new PSU, I'd be very surprised if that fixed the faults now evident in the BQM. I'm afraid that you do need another technician visit, that needs to work out what's causing the interruptions, which in my view is likely to be a connection or a cable problem.
Message for forum staff, could you review the previous BQM images posted 4 weeks ago by nad223, and this latest one - seems obvious the underlying problem has not been resolved? There appears to have been multiple technician visits already, and there's comments suggest some issues between customer and AFM. I would suggest it might be appropriate to consider referring this to the CEO Complaints team to work out why the fault is not being correctly diagnosed and fixed, and whether the customer has received the sort of service they might reasonably expect from both telephone agents and the field team.
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