2.4.1 locks hard when you leave it alone for 10 minutes or so. This may be related to the fact that to run 2.4.1, I had to remove the "pci=biosirq" kernel flag (which it says it needs at startup). Leaving the flag on makes it die horribly when loading many modules.
Perhaps 2.4.2 will hold something better. I sure hope so, because all those reiserfs error messages in my syslog can't be good... :P