Same thing has happened to me the past few days. I figured out it was a game I played for a few minutes that was still running in the background. Once I close the game the screen times out properly.
Real easy enough to check to see if that's it. Next time it happens just hold down the home key for a few seconds. Doing that shows the last apps used. Up to the last 8 will show. Close any apps that wouldn't normally run, and see what happens.
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