@Virgo Yes, primary wan is working. Everything started working normally when I unplugged the backup wan Ethernet cable from the router. All devices (30+) are connecting to the internet with no issues. 
 

Everything was working just fine before my backup wan device received a firmware update recently. Since then the device loses internet connection after a period of time until it is restarted. Regardless of the issues with this device, why is the router getting hung up on issues with the backup wan when all connections should be routed to the primary wan which is working perfectly? Is there something wrong with my settings shown in the screenshot? Are there other settings I'm missing?

  @d0ugmac1 I'm not sure how to setup link detection. I'm using an OC300 controller. 
 

I am able to consistently re-create this problem. When the backup wan does not have an internet connection everything will be fine for a few hours or so. Eventually devices stop connecting to the internet or are unable to reach certain sites. As soon as I unplug the backup wan cable everything works again. 
 

For example, my laptop is connecting to the internet through the primary wan. The speed test results back this up as the backup wan cannot deliver that bandwidth. However, I cannot connect to certain sites/links. I get unable to reach host messages. As soon as I disconnected the backup wan cable everything worked. This is the case with multiple devices on my network, wired and wireless.