From about 2GB memory size individual images were on the PC (several tested) no longer legible. With an increasing amount of data it became more and more broken images. Once my card broke down completely and was not even on the PC format. A data recovery was no longer possible at this moment. I later found a solution, see below.
Conclusion:
This memory card is rated mostly positive. Apparently it takes Transcend with the final not as accurate and I just had bad luck. Before one but pictures makes you really want to have, I would advise everyone his card once to photograph fully and check for faulty images.
Solution:
The map on the PC was no longer legible and also could not be formatted all my attempts of data recovery were futile. At the end helped the following: Card in the camera format, connect immediately to the PC and start data recovery as "PC Inspector Smart Recovery". So that I could bring back a lot of pictures. Who tried it also so natural doing at your own risk :-)