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Could be a corrupt book, wonky font, text formatted as greyscale, a display fault or or bad drugs, I suppose. Kinda need more details or a pattern to do more than speculate. If you have more information, let us know. Or perhaps someone has had a similar experience and delineated the likely cause.
Was it one or two specific books that did this? Did the same book that went grey do the same thing when reopened a second or third time? Were you able to download a new copy of that book to see if that resolves the issue? Did you try a different font? Have you had any other hardware issues or has the device been dropped recently?
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