Hello sasylady,
Thanks for that info and for choosing the Apple Support Communities. If I understand correctly, you are having an issue with an unexpected alarm on your iPhone. First, make sure your iPhone is up to date, as the updates contain stability fixes that can resolve issues like yours, as well as important security updates to keep your iPhone safe.
Update the iOS software on your iPhone, iPad, or iPod touch
Next, use iTunes on your Mac or PC to backup and restore your iOS software to factory settings, as this process erases the information and settings on your device and installs a fresh copy of the latest iOS software. Temporarily set up your phone as new to test your issues, and then restore your back up and test the issues again.
How to back up your iPhone, iPad, and iPod touch
Transfer photos and videos from your iPhone, iPad, or iPod touch
Restore your iPhone, iPad or iPod touch to factory settings
Restore your iPhone, iPad, or iPod touch from a backup
Cheers!