Sorry Stefan, I am sick and either did I think to post something here at the right moment nor I was able to write you a PM, sorry 
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Yes, I spoke too soon as well. It worked a couple of times then this morning it went back to not working. 
I have this sometimes when I have the alarm on for longer, the screen blacks out again but the option to slide to turn of the alarm or snooze was there.
Then if I turn on the screen again the phone is locked, I have to unlock it all while the alarm is sounding. Then I can turn off the alarm, but I have to go to the clock app, then alarms, then turn it off.
Sometimes the alarm is in the notification bar, and I can turn it off that way, but sometimes it isnāt and I have to open the clock.
Itās a small nuisance but not worth troubleshooting for me. Mostly I am awake before my screen times out again. You could also try having a longer screen time out setting, and see if that allows you to turn off your alarm?
Since the big software update I have the same problem. My alarm goes off, I swipe to stop the alarm and turn on the phone and sometimes the alarm keeps going off. I have to restart my phone to stop the sound of my alarm.
It never did that before the software update. It is not all the time, he did it now three times since the update.
Anyone an idea to resolve this problem?
I have the same problem.
Sometimes it is not possible to stop the alarm.
The phone starts, but the music doesnāt stop.
Any news on how to solve this problem?
Iāve now learnt to live with it, James. But thanks, Alexis
Yes, Iāve had this problem for nearly a year now. Itās a pain. But it sounds like my problem is a slight variation on yours ā 50% of the time when the alarm goes off the screen is blank and the only way I can turn the alarm off is by taking out the battery. Iām afraid Iāve just learnt to live with it.
Alexis
For the first time this morning I have had a similar problem.
I donāt set any alarms but on my way into work I could hear an alarm going off. Didnāt think it was mine so walked on until I realised it was following me! The phone screen was just displaying my usual wallpaper so there was no option to turn the alarm off so I had to shut the phone down to get it to stop.
Usually my alarm works ok, but every so often I have a similar problem. When the alarm sounds I turn it off and everything looks normal. Only a little while later does it decide to start going off again (and I promise Iām not hitting snooze by mistake!). When this happens it canāt be silenced except by turning the whole thing off. Itās probably more of a problem for my neighbours whom I share a wall with, because Iām usually in the shower and out of earshot by the time it decides to go off againā¦
Since you are experiencing crashes also, it seems that your system got messed up quite a bit. Maybe it is indeed time for (a proper backup and) a hard reset.