Bumping this thread... I have the same problem as the original poster. It makes me laugh that this problem existed 4 years ago and is still present...

I am running Limewire Pro 5.1.2...Java 1.6.0_11. I will see if some Java upgrades will help. This is on an XP/P4 machine if it matters. I have not been able to tell the whens or whys, only that Limewire tends to shut down without any conspicuous error messages.

I have virtually no power management running...only a monitor shut off after a period of time, but it's not tied to the randomness of Limewire's crashing