iPhone alarm is silent randomly

Okay is it just alarms that aren't sounding? Or is it something else as well?

This article may help:

If you hear no sound or distorted sound from your iPhone, iPad, or iPod touch speaker - Apple Support

My ipad2 alarm suddenly wouldn’t sound after the 10.3.3 latest update. Luckily I set 2 alarms on my phone and use the iPad as he backup. When I tested the alarm sounds under options, they would not sound until I checked “none” and then re-tried the other sounds. Hopefully that’s a full fix and not just a one-day fix.

I have the problem that the alarm or the timer in the "clock" app sometimes chrash the whole iPhone X speaker system. When i set a alarm i didnt hear anything. Only vibration is working. When that happens both speakers crash and there is no sound anymore (no music, no other alarms, no keyboard sounds etc.). Only way to fix this is to reboot the iPhone. Restoring via iTunes, hardrest etc. didnt fix that. The problem came back. Happens on iOS 11.2.5 and 11.2.6. Think its a bug in the clock app... Cant trust the iPhone anymore...

My alarm clock has done the same thing to me and I think i know why....many of you say you set multiple alarms. Do you snooze the first one? I usually set 4 or 5 alarms and eventually, after snoozing them many time, the 9 minutes intervals will eventually pair up for two or more alarms...when this happens, the alarms will “cancel out” leaving the notification on the screen and not the sound. Also happens if you get a call at the very same moment the alarm is about to go off, I’ve witnessed these myself. Try spacing your alarms out or not snoozing..or only setting one alarm. Hope this helps!

I'm having the same issue... probably for about a year now. I found something that works from an earlier reply. When I switch the phone to mute, the alarm sounds loud and clear. I shouldn't have to remember to switch my phone to mute every night. Apple PLEASE FIX THIS PROBLEM!!!!!!!!!!!!!!!!!

Cavcat wrote:

I’ve noticed that a calendar notification that is issued at the same time as an alarm will cause both of them to be cancelled out (i.e., the alarm will not sound and the notification will not be displayed). I do hear a very truncated sound which can easily be missed.

I don't know if this is a known problem.

I've never heard it mentioned before but, it is known that setting an alarm in Bedtime at the same time as the standard alarm will result in no sound. So, this makes sense. Good detective work.

I had the same problem till I realized the bedtime app shuts off everything to provide you with the amount of sleep time you scheduled. No alarms or anything.

My newest problem is that whenever a notification comes in my alarm shuts off or snoozes. I changed my Do Not Disturb to 10 minutes after last alarm in hopes that helps.

So you’re snooze doesn’t work? I tested my theory to this in basic form

2 alarms without snooze few mins apart. First alarm sounds but if I turn it off with the volume buttons the second alarm wont go off and it only shows the first alarm going off but no sound from it.

2 alarms without snooze and a third alarm with snooze. Same results as above but the 3rd alarm with the snooze went off with sound. But without snooze on it won’t go off because the first alarm being shut off with volume buttons.

Other buttons shut the snoozless alarms off and the others work

In addition to the suggestion that we've been making for a long time that you periodically clear out your alarms, I recently read another interesting one. Set a second alarm for one minute later than the first alarm.

So glad I found this discussion. I'm a QA Engineer and for the past 3 months I've been dealing with the same problem with a 3rd party alarm app (has a lot of dependencies with apple's own software). Like somebody already said, this issue has many forms. It can be user related (alarms overlapping, device sound settings etc) or iOS software related. I've been trying multiple testing scenarios over the past 3 months and my conclusion is this: Randomly, and pretty seldom (for the most users during night-time ) the whole device sound system suffers a crash (or not necessarily a crash but an error of some kind) and due to this error the alarm will not make any sound. But hear me out, this is where it gets interesting; In a lot of scenarios I had more than one alarm in the morning set to, say, 6.00 and 6.30. In most cases the 6.00 alarm did sound and after stopping it, the 6.30 alarm did not sound (which for me is quite peculiar because the error should also affect the first alarm and not only the second one). However, if the device is brought close to the ears, a very low hissing sound can be heard with consistent frequency for the alarm that did not sound (or as some other users pointed out, no hissing sound but a very very low alarm volume). I'm still trying to get consistent reproduction steps for this. I think Apple is aware of this issue but because it happens so randomly and has a lot of different occurrences it's pretty hard to troubleshoot.

OK I think I figured it out. First turn off bluetooth in the control screen, second make sure your phone is not screen side down. When your phone is face down on your bed or floor or nightstand the radius sensor on the screen side triggers, because it “thinks you are on a phone call” and it sounds a silent alarm so it doesn’t blow your ears out. This is why you see so many people say that the first alarm works but the second one doesn’t because they’re sitting there phone down on the nightstand screen side down and then alarms wont work.

Turn your phone OFF and ON again in future... just worked for me haven had same issues you did.

Resetting my phone's firmware resolved it for me.

My audio for alarm stopped working also, about a week ago, it just stopped.

I deleted the alarms and set them up again, used different sounds, nothing works to allow sound.

Turning the mute switch off will work - but I do not want to hear all the other alerts while sleeping

Unfortunately, I’ve been having problems with this for years, no matter how many updates and other fixes I’ve tried. I’ve even completely wiped and restored my phone and it still happens. What I ended up doing to avoid losing my job due to accidental oversleeping was get an actual alarm clock. I have a $15 digital alarm that makes a horrible sound but at least it works. I also have a sunrise alarm clock that I really love that’s much more pleasant to wake up to, but was much more expensive. After trying everything on this site, this is the only workable solution I’ve found.

This is by far not the only problem that I’ve had with this phone. The most recent updates first rendered me unable to make calls, and eventually completely crashed my phone to the point I thought I might have to replace it. My previous iPhone worked great (and also cost much less!) until I foolishly updated the system and planned obsolescence caught up with me and slowed the phone down so badly I could barely use it. Needless to say, I will not be buying Apple products again in the future. It’s completely unacceptable that a product customwers pay so much money to buy functions so poorly. Sorry to say it, but Apple is no longer worth the investment.