Since my phone updated around January 19, 2018, my alarm has gone off 4 minutes late on more than one occasion. This would not be a big deal except that it is unpredictable and affects my "get up for work" alarm throwing my whole morning routine into chaos. I have checked to make sure that the proper time was set -which it was. (By the way, the way alarms are set in the new version of Android is obnoxious).