Sounds like you're using up too much upld bandwidth & you may also be resuming too many files.

Go to Tools>Options>Speed & tick Disable Ultrapeer capabilities & then press the Apply button.
Then go to Tools>Options>Uplds>Basic & educe the upld bandwidth to at least 80% of maximum & again press the Apply button.

May I suggest you don't use the Resume/Find Sources buttons on too many files. This will result in files queueing for much, much longer. And may also affect LW's connection quality & also make LW slow to use (use too many system resources.) These files are recognised by having statuses of Waiting #s for Sources, ends up as Awaiting Sources.

Best is to wait for LW to settle down before doing anything. Depending on how many incomplete files & shared files you have, wait b/w 10-30 mins. Then do manual searches.

Here's some 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.