Thanks for your input !
Sadly, my country is set correctly in "Manage my Kindle" - and since this morning , it's 19 minutes off after approx 8 hours in sleep mode, so I don't think it has anything to do with time zones or syncing.
I'll open a call with Amazon CS, but I'm loathing this already, since I don't want to send it in - I'm located in Germany ...
Thanks again ...
