BIG IP HA Failover happened due to tmm down.

BIG IP HA Failover happened because of the below logs on running version 11.6.0.5.83.429. Please help me to resolve this issue.

XXX Logs:

Sep 22 13:49:14 XXX notice sod[6984]: 01140045:5: HA reports tmm NOT ready. Sep 22 13:49:14 XXX notice sod[6984]: 010c0050:5: Sod requests links down. Sep 22 13:49:14 XXX info lacpd[6618]: 01160016:6: Failover event detected. (Switchboard failsafe disabled while offline) Sep 22 13:49:25 XXX warning sod[6984]: 01140029:4: HA daemon_heartbeat tmm fails action is go offline down links and restart. Sep 22 13:49:25 XXX warning sod[6984]: 01140029:4: HA daemon_heartbeat tmm1 fails action is go offline down links and restart. Sep 22 13:49:25 XXX warning sod[6984]: 01140029:4: HA daemon_heartbeat tmm2 fails action is go offline down links and restart. Sep 22 13:49:25 XXX warning sod[6984]: 01140029:4: HA daemon_heartbeat tmm3 fails action is go offline down links and restart. Sep 22 13:49:25 XXX notice sod[6984]: 010c0054:5: Offline for traffic group /Common/TG-BE-01. Sep 22 13:49:25 XXX notice sod[6984]: 010c0054:5: Offline for traffic group /Common/TG-FE-01. Sep 22 13:49:25 XXX notice sod[6984]: 010c0054:5: Offline for traffic group /Common/traffic-group-1. Sep 22 13:49:25 XXX notice sod[6984]: 010c003e:5: Offline Sep 22 13:49:25 XXX notice sod[6984]: 010c006d:5: Leaving Offline for Standby for dbvar is redundant. Sep 22 13:49:25 XXX notice sod[6984]: 010c0052:5: Standby for traffic group /Common/TG-BE-01. Sep 22 13:49:25 XXX notice sod[6984]: 010c006d:5: Leaving Offline for Standby for dbvar is redundant. Sep 22 13:49:25 XXX notice sod[6984]: 010c0052:5: Standby for traffic group /Common/TG-FE-01. Sep 22 13:49:25 XXX notice sod[6984]: 010c006d:5: Leaving Offline for Standby for dbvar is redundant. Sep 22 13:49:25 XXX notice sod[6984]: 010c0052:5: Standby for traffic group /Common/traffic-group-1. Sep 22 13:49:25 XXX notice sod[6984]: 010c0018:5: Standby

YYY Logs:

Sep 22 13:49:17 YYY notice sod[8220]: 010c006d:5: Leaving Standby for Active (best load): NextActive:. Sep 22 13:49:17 YYY notice sod[8220]: 010c0053:5: Active for traffic group /Common/TG-BE-01. Sep 22 13:49:17 YYY notice sod[8220]: 010c006d:5: Leaving Standby for Active (best load): NextActive:. Sep 22 13:49:17 YYY notice sod[8220]: 010c0053:5: Active for traffic group /Common/TG-FE-01. Sep 22 13:49:17 YYY notice sod[8220]: 010c006d:5: Leaving Standby for Active (best load): NextActive:. Sep 22 13:49:17 YYY notice sod[8220]: 010c0053:5: Active for traffic group /Common/traffic-group-1. Sep 22 13:49:17 YYY notice sod[8220]: 010c0019:5: Active