I have an iPhone 6 and iOS11 has been nothing but a nightmare since I upgraded. The built in apps (alarm, messages etc.) are rife with bugs and take at least do

I have an iPhone 6 and iOS11 has been nothing but a nightmare since I upgraded. The built in apps (alarm, messages etc.) are rife with bugs and take at least double the amount of time to do the things they used to do with no trouble at all.