Yeah, I'm wondering if the WiFi off may be part of the problem. I leave my wifi on, so I can buy new books at will. I use collections heavily (CurrentHotStuff, Done, Read2018, Paid$$, UnRead$$, Series .... a book will be in perhaps 4 collections) but I always have the Wifi on.
Then again, my kindle is new enough that I don't worry about battery issues. I just plug it in every 3-4 days, or once a week if I'm not reading.
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