Thank you for replying, Ghutche. I'm glad to provide more steps for you.
How to back up your iPhone, iPad, and iPod touch -- If you didn't back up your iPhone previously, please be certain you have a recent backup.
Restore your iPhone, iPad or iPod touch to factory settings -- This process will completely wipe the iPhone to allow a fresh copy of the iOS software to be installed. The first time through, select "Set up as a new iPhone". Feel free to sign into iTunes & App Store and iCloud. Download one of the song's you'd like to test the Clock app with. If everything is working as it should, use the "restore your device from a backup" link located in the "Get Help" section. Otherwise, contact Apple Support.
Get help
- If you see an error message, learn what to do.
- Learn how to restore your device from a backup.
If you need more help, contact Apple Support.
Cheers!