When you open LW, it's best to wait several mins for LW to settle down before doing anything. Then do a search for the sources of the files you're dwnlding. It's better to manually search for sources than using the resume function. I suspect your LW needs some optimisation. Have a look at these thread tips for getting your LW into good shape:
Tip 1 (click on link) &
Tip 2 (click on link) &
Tip 3 (Search & dwnld hints)