I own an iPhone 7 and my girlfriend owns a 7 plus. Both phones have been freezing regularly, where the screen, home and power button becomes unresponsive, forcing us to restart the phones by holding the power and volume button simultaneously. My 7 has also frozen in another way where the screen randomly goes black and displays the spinning wheel thing. Again, the only way to fix is by a force restart. Are other 7/7 plus owners experiencing similar issues?