misterious time loss while playing lightning

i use firefox 4 and chrome 11.0.696.0, have 4Mb/s adsl link, 1 0 game starts, lag indicator shows very low lag, wait couple of seconds for oponent's reply, and after a reply, my time is descreased, not oponent's! also, lag indicator shows some lag. and, of course, very soon i lose on time...

is it program bug, cheating or... ?

hmmmm... i'll test that.

yes, it could be something with connection... sometimes i lose connetion for a short while... and with it also enough seconds...

I've just lost a couple of games like this - I get a 'connection lost' message for a second for no particular reason, and then when back I've lost 10 seconds and my opponent has gained 20 - I'm not bothered about the opponent, but don't see why i have LOST time?

it seems to happen when i have poor upload connection speed - i.e. if some torrent is active...