Screen blanking problem

[Guest mclassplanet]

So far I've been very happy with my San Diego but there's a problem I've experienced which doesn't appear to have been mentioned anywhere yet, namely that on two occasions the screen has gone blank without warning whilst an application is actively being used. (Different applications on each occasion.) It's exactly the same as what happens when the phone isn't used for a while and the screen goes blank, namely that the lock screen reappears when the power button is pressed and swiping to unlock returns to the application that was previously being used.

Has anyone else experienced similar behaviour or do I have a faulty phone?

[Guest XOLO X900]

I have the same problems at times... And it's nothing to be afraid of...