I can see 3 potential problems! The 1st is Cablevision who is actually better known here as Optimum. See 1.
All Nyc Limewire Users With Optimum!, & then also 2.
Its Optimum Online ......, & then 3.
Optonline and LImewire, & then 4.
MY ongoing conversation with Optimum Online, & then lastly 5.
please help me get rid of my firewall problem..
There's more references around the forums but these were the easiest & prolly best to see.
The 2nd problem I can see is your linksys 54wrg which are known to have firmware problems. Some of these work unreliably whether in UPnP mode & at the very worst port forwarding ...
This issue & answer ... Oh but then again you have the wrg not wrt ... might not be as bad.