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Here's a tip I go often to check the logs when these conditions happen.
Goto the log folder & see what action has caused the reboot to happen. Usually the HA-STATUS condition would be defined in settings, it would look something like below.
--------------------------------------------------------------------- Sys::HA Status Feature Key Action Fail --------------------------------------------------------------------- config-not-recvd sod go-offline no crypto-failsafe cn-crypto-0 none no crypto-failsafe cn-crypto-1 none no crypto-failsafe cn-crypto-2 none no crypto-failsafe cn-crypto-3 none no crypto-failsafe cn-crypto-4 none no crypto-failsafe cn-crypto-5 none no crypto-failsafe cn-crypto-6 none no crypto-failsafe cn-crypto-7 none no daemon-heartbeat bcm56xxd restart no daemon-heartbeat bigd restart no daemon-heartbeat cbrd restart no daemon-heartbeat mcpd restart-all no daemon-heartbeat scriptd restart no daemon-heartbeat snmpd restart no daemon-heartbeat sod restart-all no daemon-heartbeat tmm go-offline-downlinks-restart no daemon-heartbeat tmm1 go-offline-downlinks-restart no daemon-heartbeat tmm2 go-offline-downlinks-restart no daemon-heartbeat tmm3 go-offline-downlinks-restart no daemon-heartbeat tmm4 go-offline-downlinks-restart no daemon-heartbeat tmm5 go-offline-downlinks-restart no daemon-heartbeat tmm6 go-offline-downlinks-restart no daemon-heartbeat tmm7 go-offline-downlinks-restart no daemon-heartbeat tmrouted restart no
Nevertheless, goto your log file & search for this keyword. Because when some action is triggered by setting, the same log will be captured with "action is to reboot"/ "action is to failover and reboot"
less /var/log/ltm | grep -i "action is"
or
less /var/log/ltm | grep -i boot
with that being said, you can know what is causing the reboot & you can update your setting accordingly. My guess, your vlan failsafe is enabled. So when traffic is not coming to your box, tmms gets restarted & links go down & reboot happens.