Iphone 16 pro max "always on" display not always on

Hi, I upgraded to the 16 pro max. Have seen a few threads logged with this exact same problem but the always on display sometimes turns off for no reason and the screen is dark. I have tried a hard reboot, and software is up to date. My understanding is the display is always supposed to be dimly lit even in a dark room? It is working 95% of the time but other times the phone just appears off until you pick up the device which activates this feature again. My guess would be its a software niggle if others seem to also be experiencing this?!