Did you reset your LW option settings?
You should give LW time to settle down. It can take a while depending upon how many incomplete files you have.
Also I do not recommend using the Resume button on many files. This is not healthy for LW. It can be effective for a few. But if you have many resumed files they will queue for much longer than they should & may weaken your LW connection quality & take its energy away. It is much better to manually search for sources to refreshen or find new sources to dwnld from.
Here's some hints on optimising LW: 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.