either remove your sd card when doing so, or fix the filesystem this happens mostly due to the filesystem on the sd card being borked !
Simple solution = remove sd card before using usb and / or update files on the sd card directly on the pc (using a cardreader) and not through the dingoo
Reason = native firmware will loop through all files EVERY time you use the usb connection to check for new files even if you didn't change a thing it will still loop through them all, files on sd card included !