There has been some instances of a few who claim to have been able to get around this by tinkering with the Wi - Fi disconnect and screen timeout settings though this hasn't worked out in the same manner for all. (goodereader.com)
Lastly, it will also keep the screen on until you're looking at it, ignoring the default screen timeout — there's enough reason to believe this feature will work more reliably than it did on Samsung phones in the past (they didn't always work accurately as they used the front - facing camera). (iphonehacks.com)