i have weird problem with arduino Due. When i power arduino due it remain frozen - loaded program is not running - but arduino accept programming using usb cable. I have simple program just to flash pin 13 led so it is definitly not software. When i press reset button on board it start to work. When i reboot it after it still working ok but when i unplug it from power for few minutes then problem is back. I did try programming and native port, external 5V power, try 3 different arduinos and it is still the same. Is there any special way how to program due ?