I have the VIVID 152 plan (broadband and vestigial line rental only). During the day I can reach 78 Mbps, which isn't great but I can live with it.
During evenings and weekends during peak hours the broadband slows to an absolute crawl. When I measured it yesterday at 22:47 using a regular broadband tester I achieved 1.9 Mbps. Latency (ping times) were similarly awful.
In fact, performing the same test another time that same night I got 290 Kbps. That's less than 0.5% of the advertised speed and beginning to approach dial up modem territories.
My Superhub is configured in modem mode.
I used a wired ethernet connection for these tests.
Exactly the same hardware and setup was used for the 78 Mbps test as for the 290 Kbps test. The only difference was the time of day.
This suggests to me that the local exchange is oversubscribed. I have tried to reach out to Virgin Media support but their recommended support option, chat, has said all operators are busy the last 3 times I tried, whether at day or night. I guess their support is oversubscribed too.
Really sorry to hear you're having trouble with your connection.
I've located your account and I can see an issue with the network in your area affecting speeds at peak times - Ref.(F003470470). Our technicians are working to get this resolved and have set a review date of 29th March.
I've also picked up an issue with your Downstream Power levels that will need to be adjusted by a technician. I've sent you a private message (purple envelope at the top right of your screen) so I can arrange an appointment.
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