Your ISP is known for shaping p2p connections...
::. Kitz - ISP Caps, FUPs and Prices .::
You could also try uninstalling all versions of Java from the add/remove programs and then re-install the JRE 5.11 offline version....This may stop you having to re-install limewire each time you want to use it...
Archive: Download Java 2 Platform Standard Edition (J2SE) 5.0 Update 11
If that does not help with your problem try deleting your preference folder/s...
Fixes for Limewire when LW isn't operating as it should