DBurnes The only forum discussions I found relate to the Tasker app being the culprit, or Proton.
Well, this one mentions Signal: #29352
DBurnes If this thing goes off at midnight, I'm gonna be pissed!
So far I don't think there are reports of that happening.
One possibility would be to disable all installed third-party apps, then reboot, then re-enable them one by one to see when the phantom alarm shows up.