Computer restarts when left on, but not asleep

I'm not sure if this is the right place to ask this, but I did some searching and couldn't find anything close. I need to leave my computer on (ie, not asleep) to keep Azureus(a bittorrent program) connected to the internet. But every time I leave my computer on, with the cover open, a few hours later it has restarted and is at the login screen. I have the system preferences set to not shut down the hard drive and to never sleep, but to turn on the screen saver after fifteen minutes and to put the display to sleep after 30 minutes.
So I have two questions. Is there a way to keep Azureus connected to the internet while the computer is asleep? Or is there a way to leave the computer on but not asleep without having it constantly restart?

Welcome to the Apple discussions.
You posted in the Powerbook discussion area, and your tag line says iMac G4 .... if your question is on the iMac, you might also want to post it in that discussion group at http://discussions.apple.com/category.jspa?categoryID=132. That said, most of what follows is applicable to either system.
I don't use a screen saver, rather, the display just goes to sleep after 10 minutes. I let my hard disk sleep, which doesn't impact the ability of the system to stay awake and functional.
Azureus, or any other program, won't work when the computer is asleep.
Having the system reboot itself is odd. You might want to delve into the console log to see if there are any messages before it reboots. On the energy saver panel, do you have 'restart automatically after a power failure' checked? If so, you might want to uncheck it.
You might want to try a different bittorrent client, too. I like Transmission. It doesn't have the graphics that Azureus has, however, it works like a champ. You can find it at http://transmission.m0k.org/download.php
Another step you might consider is resetting your power management unit (PMU), as settings can get jumbled over time. See this Apple note on Powerbook PMU reset: http://docs.info.apple.com/article.html?artnum=14449 . iMac PMU reset is http://docs.info.apple.com/article.html?artnum=95165
Has this only happened while on OS X 10.4.2? If yes, consider upgrading to a newer release.

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