BGP was observed to be no longer established due to BFD no longer transmitting or receiving.  After triaging the issue, this was found to be due to the interface xe-0/0/0 going down.

Checked the logs and found the SRX chassis HOST cannot constantly detect the port correctly, it should be some hardware issue with the chassis.

/var/log$ grep portcount chassisd.5
<xxx> pic attach pic 0, flags 0x0, portcount 8, fpc 0 slc_slot 0  <<<<<< should be 9 instead of 8
<xxx> pic attach pic 0, flags 0x0, portcount 9, fpc 0 slc_slot 0

This issue has been resolved after replacing it with new RMAed part.