Since downloading iOS 11, I've had quite a few problems with my iPhone 7 Plus: -Sometimes launching an app will freeze my phone for a couple of minutes. -Maps will randomly stop giving me directions. -Cannot control music through the Control Center/what's playing now doesn't show up on the lock screen. Happens with both the Music app and Spotify. -Speaker phone doesn't work. -Alarm will not make sound, only vibrate. If I turn my phone on and off, everything will work again for a bit. Until an app will freeze my phone and then make all these problems start up again. Any suggestions what to do?