Display not switching on after 2-3 times power button - but after work

Hi there :)

Additional symptoms:

It is happening when iPad is off for….. don’t know - 10 minutes? In deep sleep? Display is on always when display switch on - then it works right away when power button pressed (so button must be fine)

When iPad is off for longer - when power button is pressed - backlight is on - but no display - just backlighted black background.

I cannot take it to Apple warranty as one hairline crack display - LCD works perfectly fine - not a single dead pixel.

Could it be LCD problem? I’ve seen many damaged LCDs but never acting like that (few times to power button to press to fire up)

Could it be iOS problem?

Thank You