@Shaggy: no, i didn't because i saw the same effect when the device was introduced in a german product demonstration so i think it's normal to happen from time to time. and as i said: the problems totaly depend on the pdf files i use - as long as i optimize them for 4.0 and above i don't have problems - but i do have pdf files where the user password is set so i can't alter them... (and sometimes i don't have the 'strength' to boot up windows on my mac to decrypt an encrypted pdf
)
@grimulkan: i set the sleeptime manualy (in the ini file) to 360 seconds because i have problems with the wacom stopping to work and double refreshes at page turns - now it drains the battery again very fast but at least i can use it as a reader