They blamed a sandstorm, but the Taiwanese operator blamed the Japanese owner for it. And the Japanese operator agrees. Basically, we're not getting the real answer to this question. Also, the following:
> However, the chairman of Egypt's Suez Canal Authority said Saturday, without giving details, that weather conditions "were not the main reasons" for the grounding, and that "there may have been technical or human reasons," the BBC reported. An investigation is ongoing.