If it's the A7..I solved my issue….
Settings…advanced features… motions and gestures…
Now deselect the double tap on/off features…
This solved my issues..no reset needed..apparently when I open my case I double tapped my screen.. check and see if this works for you… Good luck and as a wise man once said….. Crush you enemies…see them driven before you.. and hear the lamentations of their women..(thank you Conan)