Comment Auto-Reboot (Score 1) 181
GrapheneOS also has an auto-reboot feature that causes the device to restart automatically if no input is detected within a certain timeframe, and that timeframe is user-configurable. Under system settings, Security & Privacy, and then Exploit Protection, the reboot deadman-switch interval can be set as long as 72 hours and as short as 10 minutes, with numerous options in between.
Rebooting restores the device to BFU mode where keys are not in memory and biometrics are not accepted for unlocking the device. So if the reboot interval was set to something like 8 hours (or even the system default of 12, which may be preferable as one could claim that they weren't aware of it and didn't make any setting changes) then by the time the phone gets to someone with an interest in forcing it open, it's going to be a lot harder to force open, but nothing will technically have been deleted.
Computers and phones restart themselves all the time, sometimes user-directed and sometimes due to a crash or other unexpected failure. Considering that the only way to verify auto-reboot was even in effect would be to unlock the device and inspect the system settings (a process now rendered difficult to the point of practical impossibility) plausible deniability should be in effect.