So is this on a VPN? If on the same network from the Source to Destination then you dont need the WAN feature try without as it sounds like it is flipping back and forth.
[No, I've taken the VPN down. But, the IP addresses are on from the same ISP and at locations on their network.]

Crank down the Bandwidth to 10MB for the task.[I currently can't access the IP via GUI, can that be done from console? Or, do you have a suggestion as to how I might bring this back, such as default it's NIC settings then change back to conform to my LAN?]