It sounds like your ISP is shaping your use of p2p. Well if your isp is suddenly blocking or filtering, you could try a few things. One is to try at a different time of day. 2nd is to change the ports, ie; go to LW's menu bar, Tools>Options>Advanced & change the listening & connection ports to one between these 49152 - 65535.

BTW do you see a brick wall in front of the blue world icon at the bottom of LW's interface? Was it always like that?