I'm noticing that although I get lots of search results, the ultrapeers get knocked off constantly. I'll sometimes be downloading over 10 files and then all of a sudden, they all slow to 0 kb/s or begin requery and I check my connections and they will all be gone. Sometimes a couple will stay on, but the rest ~ gone! It happens alot these days. Very strange.
I wouldn't think that everybody is quitting LimeWire (or their respective client) at the same time! But it's irritating when you have about 100 incompletes waiting to finish.