Thanks for the log packages and the first log. I took a quick look at them and I have no freaking idea what is going on. The node.js install is throwing errors for node modules that are not directly even in use by the Node Server.
What version of PG3 are you running?
What version of Node.js is installed on your Polisy? (From the command line ssh session) run "node -v" this will output the node.js version.
Top of my head says that something with Node.js is wonky. Could be Node.js version installed and module compatibility or worst case the jishi node-sonos-http-api used by the node server has some serious compatibility issues with the node.js version. Dunno yet.