VM usually has jitter
Some areas where are not many VM users are lucky to have low jitter or some after area upgrade also are lucky to have low jitter too
Set up a thinkbroadband to watch your line quality such maybe packet drops,or jitter/high latency
That will help you see if is any congestion as well
Keep an eye in this thread for some VM monitor graphs to compare with your connection
http://www.cableforum.co.uk/board/12...-page-137.html
The only you can do is to contact VM if you are in congested area (thinkbroadband monitor will show and VM is accepting it as evidence)and if is congestion ask if will take any future action (and if ...will be usually after long time)
OR
try reset the Superhub (at my case had to reset it over 20 times) if will lock after the reset to a less congested channel
http://www.cableforum.co.uk/board/35464997-post9.html
Note the blue around 12-6pm jitter was around 15ms after reset jitter was 0-1ms