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I have same problem with Asus Zenfone 6. What I did is I uninstalled the Asus Digital Clock & widget apps in Google Play store.  After that I did testing again, and the problem solved. In my case, Chiranjib Sarma  is correct. No hardware issue. It just a bug in Asus Clock apps. Try uninstalled (remove the last update) and test again. Hope that helps.

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