No, that's not a usaul known issue.....could have several causes.
What LW version do you have and where did you get it from?? From the official website?:
http://www.limewire.com/
What Java version do you have installed? The newest (1.5.0_07) installed using the JRE offline installer (before installing LW) and rebooted?:
http://java.sun.com/j2se/1.5.0/download.jsp
Have you recently checked your system for any trojans/worms/viruses using some up-to-date software??
http://www.lavasoftusa.com/software/adaware/(free) http://www.grisoft.com(good free AVG) http://www.ewido.com(free trial which can still be used and updated after the period has ended) http://www.ccleaner.com/download/(free) Spybot - Search & Destroy (FREE)
When was the last time that you have defragmented your HDD??
