Have you tried deleting LW's preferences folder when LW's closed? Instructions are in points 2 & 3 of the thread below. Remember the folder's hidden, so you'll have to show hidden files & folders to see it.
Fixes for LimeWire

Is your Java up to date? The latest JRE is update 9. Point 1 in that thread has a link for download. Just remember to use the offline installer.

BTW who is your ISP?