1. USB abnormality.
Reformat the USB or replace it with another USB2.0 series not exceeding 16GB
2. File exception
Try printing a test file to see if the error still occurs
3. The motherboard USB port connection is loose
Remove the front cover of the machine and check whether there are bad solder joints in the USB port of the motherboard.
None of them help, it is recommended to replace the motherboard.