worked pretty well for a week ...

It all started with the fact that they had shut down due to low battery charge. When I came home at night, I as usual connected to the computer via USB to load the camera, but the device did not recognize just the inserted memory card. So I've now bought a new memory card, with the result that the device also does not recognize the card to me.
Meanwhile, the unit can not even turn on, despite the battery is charged. The referred to in item 17 in the manual and in the legend to the exploded view as "Item 9" designated "reset hole" exists not appear (in the drawing, there are only Note 8 and Note 10).

Conclusion: I'll probably dispose of the part of the next electrical distributors.