Hi there, and welcome! First and foremost, if the file has actually flashed to the USB drive, I suppose it is worth trying to actually boot it up and see what happens. But, based on the behavior you have described, it mostly sounds like the USB drive has some failing blocks that are unwritable. Have a look at this blog post to get a better understanding of what might be going on: -etcher-break-my-usb-sd-card/