[cocotino]

I did that. The screen turned black, and there was no way to bring the game back, other than killing the app. Ridiculous.

[discreditable]

This is a known bug with the app. In power save mode, sometimes the app will stop responding altogether. I had a few instances where I was in power save mode, found a Pokemon and tried to tap it and it would not recognize my actions. I had this happen on Android.

[spike021]

Same, but on iPhone..

[bhtru]

What iPhone do you have?

[cocotino]

5s