Motorola X alarm clock does not go off

I recently upgraded the Operating System of a Moto X to Android Kitkat 4.4.4 when the update was released.

After the upgrade, the built-in alarm clock would not go off each morning.

Googled around and found that it was not the only one. Here is the link to the Motorola support page

To overcome the problem, I did the following steps:

  1. Disabled the default Clock app on the Moto X;
  2. Looked for some alarm apps on the Google Play Store;
  3. Finally installed this is alarm app from Macropinch

Since then the alarm does go off correctly. I think the reason for it failing may have to do with the alarm sounds, because Oxygen and Celium sounds are the same, unless they were made to sound identical.