The 7" screen works fine but when running Kodi and not interacting with it the screen goes blank after about ten minutes. The Pi is still there and I can ssh into it but it is not possible to get the display back unless I perhaps unplugs the wifi sub dongle and replug it and that sometimes wakes it back up. It is not a power supply problem. I have used independent psu and when running the Pi to HDMI to a monitor all works fine.
I have the exact same behaviour on two different Pis and screens.