For a start there are some people on this forum who
apparently work for Virginmedia so they will always say the company is great and the problem is with you and NEVER with them.
I have been having constant connection problems but someone said using speedtest is not accurate I dont know why but apparently its is not and even if it was its to be expected to get high speeds then low speeds "hi low hi low its off to another supplier I go"

.
VM has gone downhill big time recently personally I think the more people who leave them and find another supplier the better they need a good kick up the rectum.
Any comapny that provides something that is excellent rarely has a queue in their support room but with VNM you need to wait 30 minutes plus what does that say?.
Good luck.