My Kindle Touch slows down gradually over time, so I have to reboot it each week or two. The worst effects of the slowdown are lagging page turns and slow translation (navigation to a dictionary and back). I'm using a dictionary often, so this might be a reason for this behavior. I've found a description of the same symptoms
here.
My Kindle firmware version: 5.1.2.
Jailbreak version: 5.0.3 (installed it years ago).
I installed a Russian keyboard years ago (keyboard_alff31_v0.1.0). Suspected that it caused the slowdown and uninstalled it. But the slowdown remains.
Is this a known issue and is there a community fix? If not, is upgrading firmware to the latest
official Amazon version likely to help? If I do upgrade the firmware, can I downgrade it later?