He drove too slowly on his slowing down lap and got in the way of Webber who had to drastically alter his entrance line to a corner. Sato's only excuse was that he said his radio was down.
This has been discussed at a few places. Do a search for Sato to see the latest threads that mention him. Howeverthis one:
What was Sato doing?.
If you are interested here is a more general Sato thread:
Takuma Sato- deserving or not?
Thread closed: We don't need two threads discussing the same thing. Thanks.