Ethernet cfm: question on RDI allarm cisco 7609

Hi all,
I have ethernet cfm configured on two Cisco 7609s and two UP MEPs configured under xconnect PW MPLS on the same domain, level and service MA so they became CFM peers.
I notice that after removing and re-configuring olny one UP MEP under xconnect PW, the Cisco 7609 send a SYSLOG message indicating a RDI defect alarm and the show ethernet cfm errors showed RDI defect too.
Aftert 18 seconds this alarm is cleared and the show ethernet cfm errors is empty.
I don't undestand this behaviour..why the Cisco send the RDI alarm in this situation?

Have you opened a TAC case for it ?
Can you share output of:
show module 1

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