Same issue. Every two days I'm presented with a rebooted iMac in the morning. 1 external drive for Time Machine and a Fujitsu IX500 scanner attached. This has been happening under Big Sur for many months.
Zack42
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Same issue. Does this mean the sensor is bad?
I tried unpairing and setting it up from scratch - that didn’t work.
I tried a full reset- that didn’t work either to restore the blood oxygen app.