Alarm clock draining battery

It appears that after I use the alarm clock (as countdown timer), the alarm clock continues to run even after the alarm is finished. I can see it on the usage timer: even when I know I only used the phone for a few minutes, it may give me 4-5 hours usage, and the battery suddenly drains quickly; it appears the alarm clock prevents the phone from going to sleep. It happens when I stop the alarm using the off-button on the top of the phone. If I go in and exit alarm clock, it stops correctly.
Anybody else experienced this? If you have a quick battery drain, it *could be* alarm clock, weird as it may sound. I was very puzzled with why my battery suddenly drained quickly, until I narrowed it down to alarm clock.

Yeah, it's pretty annoying.

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    Does someone’s post help you? Give them kudos as a reward, as they will do better to improve | Mark it as solved if the solution works for you, so it could be reference for others in the future 
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