That machine uses servos… I wonder if you have an encoder down on Y axis… Perhaps check on the servo motor that all your connections are tight. I have seen many DSP controllers also just simply run out of usable memory. You said you deleted all files. My older DSP AWC708c has two directories for files. One for Udisk (files loaded from USB) and another just called “file” (files loaded from PC) I have to periodically go and manually delete both directories to correct a similar error. For some odd unexplainable reason my DSP controller puts files in both directories when I upload from Lightburn… but not all the time. lol
update: The proximity sensor was the problem. When the head moved back, it bumped into the sensor. Thanks to help from Kyle at boss, all I had to do with restore it to vertical and move it forward half an inch.