Is something wrong?

I have four GoCoax units hooked up in my home over standard 75 ohm coax. It has been operational for over two years so I know it all works but I have an ongoing problem maybe someone can help with?

The first unit hooks to the router and introduces the signal into the 75 ohm cable to the junction box. There it is 3-way split and comes back through the home to three different rooms where the other Go Coax units are hooked to them. One of them is hesitant to make the internet connection and intermittently drops the internet and then after a bit comes back on. This is ongoing with just the one connection.

When I scan the ip's three of the GoCoax units show an ip number but there is nothing for the fourth unit. My router only shows three connected Go Coax units. I always just assumed maybe the first unit at the router was not supposed to show up, but as time goes on I think this conclusion was wrong and maybe because the fourth unit will not post an ip number I have something not set right and that is what is causing the "bashful" behavior.

Please advise why one of the four GoCoaxes is not broadcasting an ip, and IF I can persuade it to do so..

Thanks