Manual searching is much, much better (& more effective & healthier on the network) than using the Resume/Find Sources functions which have side-FX. More noticeable if applied to many files. There is an option alredy to seach periodically. Try using your Right-Click on a search result.
Also see these hints: A well set-up LW can start to automatically continue its dwnlding after it's settled down perhaps 2 out of 3 times you open LW.
Optimising LW & Maximising Uplds & Dwnlds A (1st post only) & also
Part B which is even better & last & least are
search & dwnld hints. The latter one I've been thinking about re-writing for some time. That's just for playing it safe. eg- I show all speeds & qualities.