Hi Tony. Another workaround and another cause for you. You should be able to find clip-on codes on Printables/Thingiverse etc. I'm not sure about others but certainly on the textured PEI plate, the paint they printed the code in is partially soluable in IPA so every time you wipe the plate down, the code gets less readable until you get this problem. If you avoid wiping the code, you at least extend the time until you run into this.

or you could just disable the scan on the printer. I have moved away from the cool plate for most things, I really like peo/pei plates off amazon.