Natergratr: Everybody has had issues with dwnlding music from T3 sources. Be wary of them. If possible try to choose an alternative sources such as cable/modem. 30 min songs is typical of a corrupted song from a T3 source. They generally don't have any sound & might not even be able to be opened. Oh & when & if you do a Bug Report it's best to wait until LW settles down.
JMRM: If you're going thru a network then you'll probably find there's firewalls & possibly a nat router between you & the net. These can affect LW's performance. Force ip for a start:
Force IP instructions & sample image If possible, can you get access to your router? If you have a firewall on your comp. configure it here:
http://www.limewire.com/english/content/firewalls.shtml