At least that's good news you are still able to connect to the network. So there is probably some kind of issue with your LW set-up, not your router or ISP.

Unfortunately FrostWire is also a magnet for known spammers, ie: LimeWire 4.21.1 (RC) which is really an adapted frostwire version for spamming.

In your firewall, add dual incoming and outgoing port block rules for port 27016. This will help to block a percentage of them.

I intend to do a blocklist for FrostWire at some stage, but it might not be for another month or two. This will block the known static addresses of organisations that are paid to try to give gnutella users a hard time. It will not block all spam but will block a lot of spam and DDOS attempts by them.

Actually my idea in you trying Frostwire was (1) to make sure you could connect to the network outside of LW. (2) if FW is able to connect, then perhaps try LW again. But it depends on which program you prefer. FW is very similar to LW 4 and lacks a file size filter for search results. And yes, FW included a lot of other stuff I was never interested in. File_Girl71 might be a good person to ask about how to avoid that other stuff. I rarely use FW myself, unlike FW's early days when I enjoyed using it.

Which version of FrostWire are you using may I ask?