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Stop Using Your Face or Thumb to Unlock Your Phone
(gizmodo.com)
This is a most excellent place for technology news and articles.
On Graphene/Calyx you can auto-restart the phone after a given time period if it hasn't been interacted with. Recommend turning this on for all users.
What's the name of this feature for GrapheneOS? I'm not finding it.
Try searching for auto reboot, or some sort of extra security settings menu.