Android 5.1 Lollipop users have the option of controlling notifications with “Do not disturb until next alarm” option. However, said feature was removed when Android 6 Marshmallow was introduced. It was re-introduced in Android 6.0.1 update. But now it looks like it’s gone again. A Reddit thread points out that some users even saw it disappear while they were using the phone. According to Android Central, it seems to be happening to the Nexus 6P. But the Reddit thread points to the Nexus 5X.
An update on Reddit though claims it has to do with the date, “People figured out it had to do with the date. Change your date to past the holidays and it will reappear. Why Google did this... I don't know.” Anyway, if you’re one of the few who has the latest Android build, it’s best you know about this in case you miss an important alarm because of it.
Source: Reddit + Android Central | Via: The Next Web