Maybe some general comments about this.
A load above 100% is not an issue per-say.
A Dreambox One/Two has six cores which can lead to top showing up to 600% CPU load.
But your "error description" was lacking pretty much ANY additional information so it was totally impossible to understand that your device was under permanent load.
Please try to describe your issue a lot more in detail next time.
This error was reported on the 820 while I was surprised that it did not exist before so I reinstalled the latest update and the problem was resolved. Of course, this problem was more of a numerical error than the use of CPU power, because in practice, this percentage resulted in the least regression of the image.