I have also had this problem. I think that Asura does not write correctly to the SD card. I chased this problem for several days and finally i tried a new SD card formatted by the computer and then saved all gcode files to the desktop. Then drag the gcode file to the sd card and let the OS do the writing. No problems since. I suspect Asura corrupts the SD after a while. I also had, at the same time, a microsoft download that i did not request of their Edge web browser. That software corrupted both of my shop laptops before i noticed the Edge icon. The Edge software was loaded during an update, unrequested. I had to restore both laptops, too almost a week to accomplish. I am not sure how long Edge was on the laptops but neither computer could write to an SD and was having problems opening software and documents. So i am not sure what corrupted the SD card, but saving to the hard drive and then copying to the SD has worked fine since the restore. By the way the Moai would spend an hour on a tiny file on layer 1 and never progress. In fact it never turned on the laser except for a brief flash in the very beginning.