Grafana Dashboard Disapper

Hi Team ,

happy day:)

My dashboard frequently disappearing .

In Log :
t=2019-11-12T13:34:40+0100 lvl=dbug msg=“Scheduling update” logger=alerting.scheduler ruleCount=0
t=2019-11-12T13:34:50+0100 lvl=dbug msg=“Scheduling update” logger=alerting.scheduler ruleCount=0
t=2019-11-12T13:35:00+0100 lvl=dbug msg=“Scheduling update” logger=alerting.scheduler ruleCount=0
t=2019-11-12T13:35:10+0100 lvl=dbug msg=“Scheduling update” logger=alerting.scheduler ruleCount=0
t=2019-11-12T13:35:20+0100 lvl=dbug msg=“Scheduling update” logger=alerting.scheduler ruleCount=0

No error found!

Note: But the dashboard is showing in the manage tab