I've read a few people are having problems where their home or back buttons have a delay or are sometimes unresponsive. I have experienced this a few times in the last two days with the back button, but it only happens when I am in an app that has the annoying 3 dot menu button on the bottom. If you are having the problem check and see if that is when it is happening to you.
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Sent from my HTCONE using Android Central Forums