the pro version is not better. it just comes with support, and no ads. i think there's a link on the limewire site for 'pro' support. i've never used it since I only have free limewire (with ads). since you have a pro version, you should maybe go there.

regarding your downloads. there's one thing that might help: to reduce network traffic, limewire doesn not do automated re-queries any more (since version 2.9.x). in 2.8.x or lower, limewire would automatically re-search for a file in the download queue after a certain amount of time. limewire doesn't do this any more, so, if you download from 4 hosts, and these hosts all disconnect, your download stops.

there is a solution, however: you can manually re-search for the same file. if limewire finds new hosts, it will add them to your download queue. so just re-search when the download stops, or, say, every hour or so, that could solve your problem.

regarding limewire figuring out how to fix it: i think there are links on the limewire site somewhere to get in touch with the developers. so maybe you should do that, having paid for the pro version