The LCMD (Linux Chassis Management Daemon) is a process that is running on the packet forwarding engine and communicates with chassisd process on the routing engine.
Due to a rare timing issue, Chassisd processes LCMD connect message after 10 sec of sleep, and by that time LCMD has sent multiple reconnect messages (as lcmd was listening from chassis in that duration).
When chassisd processes these reconnect messages, it thinks that lcmd connection is unstable and raises this alarm.
SRX1500, SRX4100, SRX4200, SRX4600, vSRX2 or SRX5k with SPC3 might display alarm "LCM Peer Connection un-stable". The following command can be used to check this issue: root@srx> show chassis alarms 1 alarms currently active Alarm time Class Description 2020-05-09 09:10:11 GMT Minor LCM Peer Connection un-stable
This is a harmless alarm that doesn't even count for HW-monitoring failure.
It has no impact on traffic or on the stability of the cluster.
Workaround