Have you installed any Apps recently? If so, try uninstalling the App and see if that makes a different.
Do you have an external SD Card installed? If so, try unmounting it (Settings --> Device Storage --> Unmount Storage), removing it, and turning the Edge off and see what happens.
Try powering down the Edge by holding the Power button and see what happens.
Try powering the Edge down by long pressing the ROTATE button on the LCD side until the pop-up menu appears and see if this makes any difference. Doubtful, but worth a try any way.
Last resort, again, absolute last resort is to try a Factory Data Reset or you may have to reload the OS. Hopefully, the solution will be simple and it won't come to this.
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