Problems with memory card

The card came, as usual, Amazon quickly. I used them in my new video camera (Panasonic HC-X909) and started chatting with the camera to familiarize yourself. After a short time came from the camera, the message "card check" - after switching off, take out the card and re-insert the card worked again. But after a few minutes the same error message. The error was reproducible. Then I tried one at my existing Sandisk card (16 GB, Class 6). This did not have these problems. I then ordered a new Sandisk card, also 32GB and Class 10. This also worked flawlessly. Therefore, the Verbatim card is not usable for me and I returned it.