i never go online with kindle (don’t need wiki ) but once i had to. it immediately downloaded anything from the amazon list (of bought/dl media) including reading samples. da** annoying.
i deleted everything on amazon.
then amazon stopped sending actual files when i bought a book. even when specifically transfer to pc or via usb was selected (can’t remember the phrase). support was useless. i stopped buying books then.
never found out what the problem was/is.
but i certainly don’t put the kindle online and let amazon upgrade the firmware in the background.