If you've been downlding & uploading heavily then perhaps your ISP has decided you're doing too much. I do know Cox does this on specific users. They are reknown for doing this; find them on the list here ISP's known to BLOCK or Filter p2p or specifically Limewire

If you follow the directions earlier in this thread then it should work on condition that Cox is not shaping/blocking your use of FrostWire. There's a more thorough change to make to the file in question if you see et voila's Sticky thread near the top of this FrostWire forum section.