I’m seeing the same thing, but have no idea of a cause or solution.
I even tried creating cron job to reboot at night, but once the problem starts, I guess “root” has no account to back it either, so it doesn’t reboot.
the tip above which said to do this:
sudo chown -R cyrus:mail /usr/sieve/
sudo chmod -R go= /usr/sieve/
WORKED in my case! thanks.
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