My N4 device screen turns off with no reason

wromero

I have  an ew N4 device, when I use it the screen turns off with no reason, keys/wheels still works but can't see buttons icons. I have to disconnect usb cable and reconnect again, but sometimes even that doesn't work.

dockkey2023

Which country are you in? Does the startup logo appear when you are not connected, and will it automatically reconnect later