i am new to this to but the soundest advice would be to go to the homepage and make sure you have the up to date version and have you tried checking your firewall see instructions here

http://www.limewire.com/english/content/firewalls.shtml

thats all ive done, yesterday i had trouble connecting after 1600 gmt today at this moment getting turbo connection good download speed, i will check later but evenings seem to be really bad i just wondering if its sheer volume causing the problems