If this is happening on all your downloads, then I have no idea what the problem is.

If it is happening on one specific download, it seems very likely that the source file you are getting is corrupted in some fashion, and whenever limwire is verifying checksums and such on the file, the data looks wrong so it is trying and trying again to restart the download from where the corruption is in the file.

If so, you are not going to be able to get that download.