BGW2100-700 does not maintain IP passthrough

Hello,

 I am having a very difficult time getting the RG to maintain passing through the public IP to my OPNSense router.  To try and simplify my network, I’d disconnected everything except the following:

ONT -> BGW210-700 -> OPNSense WAN port -> OPNSense LAN port to my laptop

All other network appliances, including WiFi router, etc. are unplugged.

I have done a fresh install of OPNSense and a factory reset of the BGW210-700.  I have then configured the BGW210-700 as follows:

• Disable both WI-FI Bands
• Change the BGW210-700 network to 192.168.0.1.  DHCP server remains on, but is not serving anything.
• Disabled firewall packet filters
• Set IP Passthrough to the MAC address of my OPNSense WAN.  
• Rebooted BGW210-700 and then OPNSense.

I’ve been able to see the AT&T public address passed through to my OPNSense but it does not last.  Last night it held it for 20 minutes, and then reverted to 0.0.0.0.  

Could this be an issue with the BGW210-700?  I’ve followed multiple posts and guides on the internet and all that are successful have done what I have done.  The OPNSense appliance is a 4 port Protectli device. Brand new.

This is driving me insane.  

Thanks.