LimeWire does not use a website for sharing. It's the gnutella network, & the files you see in searches are shared by people like yourself. That's why it's called a peer to peer network ... from one user to another.

When you cancel a download from the download window, you should also delete it from the incomplete folder in the Library window.

Go to Tools>Options>Advanced>Performance & disable all options you see there.
Check your speed settings. Make sure your speed settings are not greater than your abilities.

Go to Tools>Options>Connections & disable connect on start up. Then after opening LW each time, wait a few mins, then go to File menu & choose connect.

Don't use Resume/Find Sources on all your incomplete files. Otherwise you will stress your system & set up. That's probably why you are losing connection & crashing, etc. Try not to download too many files at one time. LW is a heavy weig ht program, & laptops are light weig ht computers.