So I just came over to the one m8 after 3 days of use I have noticed the hepatic feed back fails to work once and awhile. A quick tap to the back of the phone makes it work again, I was wondering if anyone else has this problem. I am thinking about returning the phone but I really don't want to receive a refurbished phone seeing how I just paid full price from tmobile a few days ago. Just looking for some opinions thanks!