1. If you have an internal hard drive, take it out and check if you still have the problem. If the problem occurred while playing a video file, place the file on a USB flash drive or external hard drive connected to USB. If the problem no longer appears, the internal hard disk is not compliant or has a issue.
2. If the problem persists, go to MyApps and click Factory Reset. More info here:
3. If the problem still persists, please try the firmware restore procedure: