I recently installed Graphene on Pixel 5, just a few days ago. Strangely, last night something disabled my alarm and DnD. I use the stock clock app, and my alarm is set to 6 AM on Mon-Fri.
I also have Do Not Disturb set between 8PM and 7AM, and alarms are allowed to override this.
This morning i woke up to a tiny beep, a daily reminder from Tasks app at 6:15, noticing the alarm had never rang (it's loud, not a possibility to sleep through it). And yet Do Not Disturb wasn't on either. Something had happened, but does anyone have an idea what?
The Updater app had updated overnight, but was pending reboot because i have disabled automatic reboots. Can a system alert like the Updater disable DnD?
Even if it did, i don't see why it would mess with alarms.