I updated my iPhone and iPad (a 32 GB 5s A1453, and a 16 GB Mini Retina) to iOS 8 (and subsequently 8.1) and have had nothing but issues with both devices since.

On my iPhone the messaging app will freeze up frequently, and whilst will still allow me to get new messages, I won't be able to read them until I force close it. If this happened once or twice, no problem, but it is 3 to 4 times per day. The new thing is the screen is starting to become randomly unresponsive. This is just a wait and see, sometimes locking and unlocking the screen will work, sometimes not.

My iPad, the keyboard will pop up, then go away. Again, I need to force close whatever I'm using to fix it. Now the more annoying part: WiFi will stop working. It will show connected, but will time out. None of the other devices at home have problems at the same time. I need to swap from 2.4 to 5 or vice versa, to get things working again.

I should add, none of these problems happened until after I did the upgrade. So... is anyone else having this problem? I've already reset both to factory, and started from scratch, twice.