OLT - MA5800 - Slow CLI operation: What to do when the OLT CLI is slow to respond to commands?

Equipment: OLT
Model: MA5800-X15

Version: V100R019C12

Uptime: 416 day(s), 21 hour(s), 32 minute(s), 52 second(s)

Bayface:

  Command:

          display board 0

  -------------------------------------------------------------------------

  SlotID  BoardName  Status          SubType0 SubType1    Online/Offline

  -------------------------------------------------------------------------

  0     

  1       H902GPSF   Normal                           

  2       H902GPSF   Normal                           

  3       H902GPSF   Normal                           

  4       H902GPSF   Normal                           

  5     

  6     

  7     

  8       H903MPLA   Active_normal                    

  9       H903MPLA   Standby_failed                       Offline  

  10    

  11    

  12    

  13    

  14    

  15    

  16    

  17    

  18      H902PILA   Normal                           

  19      H902PILA   Normal                           

  -------------------------------------------------------------------------

The OLT is currently operational and has many customer ONTs connected to it. Service is perfectly normal, but the CLI operation is really rubbish and slow.

For instance, the command save configuration is not executed.

Then we get this error message:

The CLI shows this message but is does not actually save. When we see the saved-configuration, the configuration is different from the current-configuration. So configuration is not being saved.

When data is saved, the operation is successful:

The OLT is taking long to respond to the command display current-configuration as well, sometimes it does not show the whole configuration.

What can be done to solve the save problem and the system slowness problem? Could the OLT be in some sort of loopback?