When i used it for web I hit a max of 6 simultaneous connections in chrome. I seem to recall that it was an (intended) browser limitation - but it doesn't throw any errors, so it's not very obvious. I forked the socket-pouch library and changed it a bit to sync unlimited db's over a single websocket connection. It worked like a charm (despite my messy code).

If you're hitting the same issues, this might be it. A non-throwing limitation in the browser runtime.