The most frequent problem I have is when I'm trying to play, is when my myself girlfriend is downloading a video from her laptop at the same time I'm playing, putting extra load on the home wireless network. The game starts fine, but the further into the game it goes, the more likely I believe a packet gets lost, effecting gameplay. I can sit there and wait for an opponent to make a move which wont arrive and my time appears fine while his runs downn. If I refresh my browser, the system shows my time to have lost a minute or however long its taken for me to refresh my browser, while the opponent made an instant move. If I dont refresh my browser, opponent will lose on time, game gets checked on server and I win.
Only explanation I have is that a packet got lost along the way. The work around is to ask gf to stop downloading the latest soap, which is not good for keeping the peace. If you cannot replicate the problem, I can take snapshots next time I'm home for evidence. Home connection is 50Mbps, windows7, I've tried using various browsers, problem still occurs.
Get the T-Shirt here http://www.cafepress.co.uk/ChessCube.550862183