Aura KA1 slows down

As I'm approaching the end of a book AND the 56% charge level of the battery, my KA1 is gradually slowing very noticeably with its page turns. I've noticed slow downs in the past; however, this is the first time it has occurred to me that it might be due to either being further along in the book or being further toward a lower battery charge (with the latter seeming to be the most logical reason).

Any thoughts, please?

Thanks!

. . . . Pete