There really is no fix, Searchable only works on a clearly defined font.
Throw some freehand note or a weird font at any OCR software and you will get odd issues.
Xerox printers usually fault after an extended period, not a good response to a problem to be sure, but probably too difficult to program it to identify that it isn't bright enough to figure out what is on the page and give you a kindly worded message about the quality of your penmanship ;-)