Screen input delay after moving away from face topic

Ok, so lately I've noticed when I've had to call a few numbers that need me to Press 1, 2, 3 etc on the dialpad that I can't do it right away. When I put the phone to my ear, as I would expect the screen switches itself off. When I pull the phone away from my face the screen comes on again immediately, but there's about a 5-7 second delay before I can actually press anything. In those seconds after the screen comes on, it wont accept any touch input whatsoever. It's not delayed, presses I make during those seconds just aren't registered at all, then suddenly it begins accepting input as normal. It isn't just number keys either, it's the entire screen, so I can't press End Call until nearly 10 seconds after I've actually pulled the phone away from my face, nor can I move the phone away and press the Speaker Phone button quickly.
This only happens when the screen comes on after being against my face though. If the screen is just turned off and I press the power button, or double tap to wake, it accepts input immediately, so I don't believe it's a hardware problem.

Currently running 4.4.4 rooted, image was made from stock and pre-rooted prior to being flashed onto the phone.
Has anyone else experienced this issue?