It's possible. Try deleting your LW preferences whilst LW is closed. Make a note of your settings 1st before you do this so it'll be easier to reset them next time you open LW. I think the location for Linux: ~/.limewire

This sometimes cleans out some corruption or other by freshening up the prefs. If this doesn't work then your isp might be at fault as you suggested.

Also see To continue files downlding (click on link) & its off-shoot links for xtra hints & skills.