How many connection bars are you seeing?
(a)
If LW Will Not Connect,
__ (b)
Problems with the search,
__ (c)
Hostiles List
As far as I can guess, the fault is either your ISP or the Ultrapeers you are connecting to are duds set up for this purpose to wreck problems with Gnutella users. Closing LW waiting 10 mins & re-opening can sometimes introduce you to new Ultrapeers to connect to.
If connection problems then we need more information:
System details - help us to help you (click on blue link)