LG G Stylo automatically dismisses timer.

[Android Central Question]

Usually, I try to wake up at six, because I leave for school at seven and I want to be sure that I have time to do whatever I have to do before school. However, my alarm clock (set to 06:00 Monday-Friday every weak) is dismissing itself. I'm waking up at 06:30, looking at my phone, and seeing. "Alarm for 06:00 is dismissed." This has happened day that I use my phone alarm.