Edit: After half day, my wife’s Mac started having the same problem. I have then applied the solution that I found in the Apple
Apple Release iOS 7.0.3 For iPhone, iPad & iPod Touch
Apple has just released an update for iPhone, iPad, iPod Touch.iOS 7.0.3 brings many improvements including
- iCloud Keychain
- Improved password management in Safari
- Delay of the Slide to Unlock text on the Lock screen for Touch ID devices
- iMessage fixes
- Fixes for sensor calibration issues.