Microsoft's second white spaces device prototype broke down during testing, much like its first attempt. Microsoft's director of wireless incubation, Ian Ferrel said that the device broke down on two consecutive days of testing: "We're not exactly sure what the issue is. It seems to be a power thing," Ferrell said. The FCC is still testing four other devices from other companies like Motorola.

For more on the white space tests:
- read this article from ArsTechnica