When attempting to use the touch function (pen or finger) it will initially not work. After a few seconds it will start to recognize touch. If I stop using touch for about a minute, it will stop working until I touch the screen repeatedly and then wait a few seconds.
I notice when this happens that the “Device Connected” icon shows up in the system tray. It’s almost as if the board is disconnecting the touch function after a a time and the reconnecting when it senses I’m touching the screen.