Use the power cycle to solve issues of black screen and frozen videos. In order to reboot a device, click on the reboot widget.
Once you click on the reboot widget, a popup will appear for confirmation. Click 'yes' if you want to continue.
The platform will start rebooting the device which takes a couple of minutes to resume the screen.
Note-
For devices continuously in error state contact your pCloudy lab system administrator for support.