I have written a novel (165,000 words). Text is completed. Word and grammar has been proofed. The pages are clean (error free). For many words and sentences, because of there structure in 'natural' conversation and additional spacing, I had to press 'ignore' or 'ignore all.' No problems until recently. The red and blue lines under many words have returned under the SAME words I cleaned up earlier. The document will stay 'clean' for one or two fresh openings, but by the third opening the errors return. It takes three hours to clean up the document because of the length. How do I prevent my work from reverting back to uncorrected 'proofing errors' once I clean it up again? How do I get it to STAY CLEAN?