Files do not necessarily restart by themselves. Best way is to search for each of them like you did originally to find them. That will find sources for them to download from. I suspect the "Fix Stall" etc. only tries to seek the previous ip addresses it was downloading from so if those specific users are offline or cannot find them or their ip addresses have changed due to dynamic ip addresses, then LW will not find them.
Another thing to try is delete your LW preferences folder whilst LW is closed. Make sure you backup your
Downloads.dat file first before you delete the folder.
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