Anyone with experience working the Oracle Cloud and IPSec connections?

We are in the process of setting up connectivity to the Oracle Cloud over ipsec connections. I have it setup with 3 /16 subnets to route back to our on premise network. The tunnel comes up when interesting traffic comes from one of the subnets, however when traffic is generated from another subnet the first subnet stops getting return traffic from OCI. Anyone with any experience that can shed some light on this?