Looker dashboard auto refresh stopped working

I have some dashboards apparently configured with auto refresh, as I can see the "refresh interval" from "dashboard" explore. However, I think the dashboards aren't refreshing as set, because there is no history of dashboard running at all. e.g. refresh interval=12 hours, I should see 2 DB queries (auto refresh never use cache) each day. 

What may cause auto refresh to pause?

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