I am experiencing a millisecond screen flickering when I push the Home button to unlock my phone. A green screen appears and it flickers and it’s gone. It’s just after the 9.3 update. Is anyone else experiencing it?

I am experiencing a millisecond screen flickering when I push the Home button to unlock my phone. A green screen appears and it flickers and it’s gone. It’s just after the 9.3 update. Is anyone else experiencing it?