When the phone is put on stand by, the screen goes black.

When I click on the button to return to my apps, the phone displays the locked screen but turns right back off, not giving me enough time to drag it up. I have to use two hands and play with it a while to "catch" the unlock screen.

The phone also turns itself off, or goes on standby, randomly after about 7 to 10 minutes of use.

Anyone else?