After you came into my thread linking this one I've quickly scanned it, and you are struggling with the exact same issue with me I think, bad SNR (signal noise ratio), basically if there's a lot of noise on the lines (not talking about wifi, but the lines into the modem), you see this with the qam, when one goes down to 32 you might not notice it, but 2 of them, or any down to 16, you definitely will, and with any that aren't 64 you might notice it, you might not.
I don't know much about power levels so maybe someone can explain the importance of that to me (if you know please let me know!)
The next things I'd be interested to know:
Are virgin aware of the issue
What is the estimated time for them to fix the issue
What are we supposed to do in the mean time as this has been going on far far too long.
The only thing I can say that might clear the noise (but I don't think it will as it didn't for me) is unscrewing the wire into the modem and reconnecting it, if it's tied into a splitter for TV as well, do the splitter on all 3 ports and reconnect.
We should be so lucky in our house on a bad day to get over 0.2 Mbps , but yeah, it's definitely lower than it should be as it is with us.
I really appreciate you bringing me your thread as it does make me think it's virgin, I wonder how close we are to each other in the same area, I've heard that neighboring areas have struggled as well today (was told by a family member, not seen it myself).