Why does my alarm occasionally fail to vibrate and make sound?

Question

I use my alarm on my iPhone 5 every day to wake up. I would say that 99.9% of the time it works.
Maybe once every few months, however, the alarm fails to go off. The phone will show the appropriately display (I use snooze, so the snooze button is ready to be pressed). When I last experienced this problem I shut the phone off and turned it back on, and the alarm triggered (noise and vibration) as soon as the phone turned on.
This isn't a case of me hitting snooze or disabling the alarm by mistake. It's not a case of a 3rd party app trying to do something with the alarm. It's not a case of using an outdated OS because I'm currently on the latest (and this has happened on other OS versions, anyway, and happened on my 3GS a few times, too). Even though it doesn't matter (because I have kept it on the same settings since I bought the phone when it came out), my phone is always on silent. So that isn't the culprit either, because alarm works just fine on silent.
This is a major problem even though it is rare. I use this phone to wake up for work. If you google it you'll see others experience the same problem (but I couldn't find a solution).
-Do others experience this problem on here?
-Has Apple said anything about it or at least acknowledged it is an issue?
-How do I get Apple to acknowledge my concerns?
If this keeps happen, even infrequently, my next phone is an Android.

Answer 1

Exactly the same problem.
Been late from work several times because the alarm goes silent.
Then when you wake up and check it, there's no ringtones, no alarms, no alerts, no message sounds, nothing from the apps, no keyboard sounds, absolutely nothing coming out of the speaker.
Yes, the mute switch is off. Yes, the volume is on. No, there's no dirt or dust in the headphone plug. I have never once even used the Do not disturb function.
Only rebooting helps.
This happens every once in a while for no apparent reason.
The thing that really disturbs me that this is my THIRD (3rd) iPhone in a row that has the same problem. Since that's the case, I've been very hard trying to figure out - and hoping - that the problem is something that I keep doing. I just don't know what it is.
Been using Nightstand app. Removed it now completely. That probably won't help either.
Had my previous iPhone5 changed to a new one exactly 10 days ago for this very reason, and here we go again - the same bug is here. Not funny.
I have been reading discussion boards a lot and it seems that this is a fairly common problem. However, nobody has come up with a solution.
If someone figures that out, he/she's gonna make a lot of customers happy.