Solved! Go to solution.
The issue was resolved by removing the Block LAN on the wireless firewall and traffic shaping. The double gateways really through me off.
I am taking over network so not 100% sure why, maybe they were future proofing. I am going to test with a new SSID to confirm if it behaves the same way.
What other network equipment is in use at the site?
We are using the MX and MR on Internal network, with a ISP Router at the edge.
The issue was resolved by removing the Block LAN on the wireless firewall and traffic shaping. The double gateways really through me off.