Can you switch debug output on with your kppp or what it is?
The same thing would happen if some of your credentials like user name or password are mispelled.
Happens this consistently or just only a few times?
I'm also with that company and since they are Virgin now, my modem connection has the strange behaviour that every second or third day or so but sometimes one day after another, my connection gets disconnected exactly twice in the first minutes.
The difference to you is that I get a working connection at least for half a minute or so, but maybe they have similar problems with their broadband lines, too. Who knows what happens there behind the scenes. 
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