I have an ER605 without a controller.  It's connected to a SkyWifi SR203 FTTC with Dynamic IP.  There's also another internet connection.  When the connection to the SR203 goes down, if you connect to it directly it goes to a splash page.  However, through the ER605, I would expect it to realize the connection is down since it can't reach Google, 8.8.8.8, etc and use the other connection.  Instead, if keeps trying to push my computer traffic through the down connection every few minutes and caches that everything isn't reachable.  How do I properly configure the ER605 to recognize when the connection is down even though it still goes to a splash page?

Right now I have load balancing enabled, with bandwidth based balance routing.  I've tried using both Auto and Manual Online Detection.  Either way it continues to route traffic to the SR203 even though it's down.

Thanks in advance.