For the past week or so I have been getting a pitifully slow download speed in the evening, e.g. 0.36Mbps.
The upload speed is actually a lot higher, e.g. 5.46Mbps.
I have a Super Hub 2. The Network Log is full of "Lost MDD timeout" messages. I have attached the Downstream, Upstream and Network logs.
The problem seems to have started around the same time that VirginMedia proudly announced that my broadband speed had been upgraded to 70Mbps. I would at the moment be happy with a tenth of that speed!
Your lost MDDs are being caused by the low downstream power levels and low downstream SNR.
Your upstream power levels are maxxed out, in short the connection is borked.
You could try checking the coax cable from the back of the hub to the cable entry point for obvious signs of damage and all connectors are hand tight. If you have an attenuator screwed on to the back of the hub, remove it.
Otherwise, you will need to contact VM for resolution, either by waiting here about a week until a VM Forum Team Member picks up the thread, or give them a call on 150 from a VM line or 0345 454 1111 for a quicker response.
Funnily enough, my broadband download speed started to improve a couple of days before the engineer visited. But when he came, he said he will still getting low power levels on my line, so he went to the cable box on the street and re-plugged me in (I think). Anyway it all seems good now, I am getting 76Mbps download speed instead of barely 1Mbps so thank you for organising the engineer visit.