Why can't I double tap to wake up my Lumia 520 anymore?

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WPCentral Question

why cant i double tap to wake up my lumia 520 anymore?

i cant double tap my screen to wake my lumia520 any more.i used to do this and i enjoyed it but my phone just couldn't respond anymore.what could the problem be and how can i go about it?
 
Re: why cant i double tap to wake up my lumia 520 anymore?

obvious thing to check: make sure its switched on

its safe to assume it functions fine with the power button?
can you make a call where the display would turn on and off appropriately (off when top part covered, on when not)