Try deleting your preference folder/s...This will reset your configurations back to default and get rid of any corruption that may of happened...
Fixes for Limewire when LW isn't operating as it should LimeWire Pref Folder in Vista
Also there seems to be more and more members having connection problems and there ISP is Mediacom...
[RANT] Mediacom blocking P2P traffic - Dont waste your money - dslreports.com
Have you tried connecting at different times of day/night?