Screen Turns Off suddenly

[wprocks]

I am running Developers Preview WP 8.1. I have noticed that if I am running Here Maps and if my screen goes off after 30 seconds then I does not want come back on with double tap. Need to press power button 3 to 5 times and double tap few times to bring screen on.

I noticed this started happening with facebook app as well.

I am on AT&T Lumia 1520 using T-Mo service.

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