My intention is not to insult Armbian developers. I'm very thankful for their work. Just trying to help a few folks here who are experiencing these reboot issues on a hardware platform that no longer gets any love here.
For those that really need a consistent reboot experience, check out the amlogic-s9xxx-armbian project on Github
I've been running this for a couple of months with zero reboot problems. Also, you'll get the latest versions