A search is & always has been the best way to find souces for downloading a file. Why a file stops & won't recontinue ... anybody's guess. I may be because that person went offline & the same or other person with same file came online later. Sometimes files stop due to sensitive connection between you & them. Perhaps their upload bandwidth was all used up with something else.

In these scenarios, I re-search the file, I will also right-click the search tab & choose 'find more results'. And if possible I will also try to browse the host which sometimes restarts the download. If not, I cancel the download & reselect from the search results.