There are several running 24/7. As I said, you must have some issue on your side. Since I added you as a seed node, and there being so few nodes available, all active clients will try to connect to you. ALL OF THEM. If that's not happening then you have issues on your server.
(The situation you describe, intermittent connections and so on, is what would happen if you have your default port closed. Because it seems that nobody who's running 24/7 is allowing incoming connections)
Well I don't know what the issue is. I'm running at port 11492 as intended.
It was well working wallet which moved mining pool. Only port is changed as you suggested.