I just got this 7 plus 32gb last week. whenever i am in call and have it on speaker i cannot get the screen to wake back up after being locked. the only trick that works is clicking the power button 2 times really fast. Its also odd i might add that locking the phone from when the call is at the top of the screen displayed in green takes 2 power button clicks to lock the phone. can anyone help me on this wake up issue?