I'm afraid Frostwire is not behaving perfectly. I have done one overnight session with it and next morning it was working, but had evidently been disconnected at some stage as it was showing a message that it was disconnected, and would continue to try to re-connect.
To day, I had it running for about 6 hours and found it dissconnected with the error notice as above. ( on both occasions DSL connection still running)
It was a matter of urgency to get onto e-bay and everything on the computer had slowed to a total crawl (if that). I had to crash close the computer, but missed the auction all the same.
So I cannot give you too many details ... Only that this seems to be a big problem, at least with my set up
Aditional details: 400 Mhz power pc processor Memory 320 MB Free Space on Start up disc. 9.5GB Sharing 2,500 files ... no downloads in this session