Could you please supply us with your model and FW version?
It will also make it a lot easier if you can share your bug report with us. Generate it right after the alarm has started and you're unable to stop it.
To generate a bug report you need to
1. Enable developer mode by going to system --> about phone --> software information and click on build number a couple of times until you are a developer.
2. Go back to system --> Developer options --> Take bug report --> interactive report
Save the report to your drive and share the link with us via PM. Please make sure that everyone with the link can view the file so I can pass it on to our developers.