SBC health went to 0

Hi,

 

SBC health went to 0%.

We get below alarms.

 

2 alarms to show
ID      Task    Severity        First Occurred          Last Occurred
65556   475855824       2       2014-12-31 17:24:14     2014-12-31 17:24:14
Count   Description
3       error adding nat information in cam table

131101  492469936       4       2014-12-31 17:24:19     2014-12-31 17:24:19
Count   Description
1       health score is at 0 (under threshold of 60)

 

After clear the alarms, health back to 100%. But want to know the reason for the box health goes to 0%.