My belief is that the screen you are seeing is the screen saver screen.
My guess is that the screen saver is set to a low time out value.
Sugestion for a remedy.
Get a keyboard with a USB plug on it, then connect it to your PV+ and push all these keys at the same time, < CTRL WINDOWS ALT DEL > this should get you to the configuration screen where you need to alter the screensaver time out.