hpqmgmt flooding event log

[JoeChan]

At 01Jan2018, one of our ProLiant DL180 G6 have Event 1128 & 1126 (Source: Server Agents)
The following is the event's content: 
Event 1128: System Information Agent: Health: Fault Tolerant Power Supply Removed. A hot-plug fault tolerant power supply has been removed from the system.
Chassis: '0'; Bay: '1'
[SNMP TRAP: 6034 in CPQHLTH.MIB]
Event 1126: System Information Agent: Health: The Fault Tolerant Power Supply Sub-system has lost redundancy. Restore power or replace any failed or missing power supplies.
Chassis: '0'
[SNMP TRAP: 6032 in CPQHLTH.MIB]
Event 1128: System Information Agent: Health: Fault Tolerant Power Supply Removed. A hot-plug fault tolerant power supply has been removed from the system.
Chassis: '0'; Bay: '2'
[SNMP TRAP: 6034 in CPQHLTH.MIB]

After that hpqmgmt sent 2 event 3 say that Power supply 1 & 2 has been removed.

After the above event 3, hpqmgmt send "event 57 : Sensor 0x80 Not Redundant FtrFlags 1 (OsHlthfncUpdateFtrRedundancy) " per min. 

Today, we check the server's power support is OK. It show green light and the fan is  normal. The server only have 2 power support, it is working now.

Anyone know what happen on the server? Does it a symptom of power support error?