On 4mb you should be throttled back to 2mb, unfortunately this doesn't work well and i know of people with 20mb connections getting less than 1mb after STM has kicked in!
The Ambit modem is fine up to 10mb although the new 250? modem is much better, i would get them out to change it, just in case it's going funny.
The biggest problem with Virgin is they are overloading their exchanges, hense having to limit your speed in peak hours....
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