Looker Dashboard randomly auto refreshes itself even though it is not scheduled

[PearlinD]

Hi,

We have a dashboard Live for a while and it is scheduled to refresh only in the evening(once a day). 

Currently we are seeing that the dashboard randomly auto refreshes itself even though it is not scheduled. The dashboard itself shows on the right corner when it was refreshed and that is not the scheduled time.

Is there a way to find out  what is causing the cache to clear and refresh automatically and also where we can see this refresh recorded in the logs. Or what triggered this refresh?