Error Passive on AB7318-B

We have an Allen-Bradley PLC EtherNet connection to the AB, to a Radar module we are testing.We have been having recording intermittent failures from the modules for several weeks - and I am trying to track the cause.

We just pulled the connector apart at the module end, found no flaky connection, and confirmed 60 ohms between the two comm wires. The AB LEDs still show:
1,2,6, solid green;
4 fast flash, 5 steady flash green

Would appreciate if you could tell me where I should look: PLC to AB or AB to our test module or within AB. I have some log files from the CANbus listener from two nights ago - have not been able to capture a single one today.

Hello,

To complete this post, we found that another unit does not have this problem, the other unit will need to be put through our RMA proceedure.

https://www.anybus.com/support/product-returns

Thanks,

Nick