This isn't the player's fault.
It's called lag:
http://support.chess.com/index.php?_m=knowledgebase&_a=viewarticle&kbarticleid=678
Check out that helpfile, it's a useful read.
Opponent's clock
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I just played against a player who was able to continually reset his clock so that he never ran out of time. The time would keep decreasing (as it's supposed to), and after he'd made his move, it would climb up again - this happened repeatedly. It even reached zero, and as I waited for the match result to be displayed, his time increased again.
Any idea how this is done ?