Alarm Malfunction

Oddly enough, my alarm malfunctioned the other day.  It just never went off and I woke up 2 hours late.  Luckily I had no tests that day, but it was still concerning.  I decided to restart my phone to see if that would help.

It has worked for the last 2 days just fine (I have also set an extra alarm on my watch for safety), so I don't know what happened.  Hopefully it keeps on working just fine like it has for the last 2 months, except for that one day...