Iphone 6s screen flickers when locked.
I recently bought Iphone 6s 16 gb. Just after using it for only 10 days , I noticed that whenever I lock my screen using power button or accessibility option , my lock screen flickers for 1 sec before going into standby mode. I could see that a lot of people are facing the same issue with their phones. Restarting the phone provides only a temporary solution. Please provide a solution.
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iPhone 6s, iOS 9.3.1