Hi Erx,
Interface ge-5/3/9, member of reth0 seems to go down in operating state.
Are you running LACP on reth0 ?
Cmds to check from Primary of SRX:
show chassis cluster status
show lacp interfaces
show lacp statistics interface reth0 (interface on which lacp is running)
Do you see any interface level alarms on ge-5/3/9 ?
Cmds to check: show interfaces extensive | match "L2 Channel"
Regards,
Rahul