I think you should try a hardreset, beacause its not normal that u get freezes during page turning with Firmware 14.2
1. Connect power source via USB
2. Switch PB off
3. During Pwr on hold lower large key and simultaniously OK button
4. Wait until Text shows. Release buttons
5. wait 10 minutes
But beware, all your books, dicts, bookmarks are gone. Do backup before.