Why does LW idle down to one host?

I'm using LW 4.8.1 running on OS X 10.4.1

I absolutely never have a problem with LW. But I can't figure out how to stop lw from dropping all my connections but one after I have not touched the keyboard in a while. Am I missing a setting somewhere?

It's a pain in the butt to move the mouse, wait on LW to sync up with another 4 or 5 hosts and wait 10-20 mins to get decent search results.