Why does my lit screen goes off after 5-10 seconds?

[iMore Question]

I then have to turn phone on and reselect the app I was viewing (such as maps)

 

[kch50428]

Try as I might - I can't duplicate your issue... After trying an iTunes re-install of your iOS and the issue still happens - you might take it to an AppleStore's GeniusBar and show them - they'll ket you know what your options are.