I, of course, the advice and support Support of Netatmo searched. Response, however, came in English and as a standard e-mail.
Overall, the weather station is an awesome thing. The right app for this is also styled beautifully. But if fails after a week of outdoor sensor, well then there is only one star. Each weather station for 15 EUR lasts longer.
What's going on in Netatmo. I send it back and let to send me a new one. Should it also be trouble here, then I can recommend the weather station does not and would advise everyone from.
Update to follow.