Display intermittently fades or turns to black

After the screen was replaced successfully, the phone after about two weeks of functioning properly, will intermittently fade or go black, but the backlight still is turned on and the phone has power. The only way to get the display to come back online is with a soft reset holding the home button and power button until the apple logo appears. No LDI s are tripped inside the phone, appears to be in a very pristine condition. Any thoughts besides the display? This was the original issue happening with the display when I replaced it.