Then this device is faulty, please get in touch with our hardware service: https://bit.ly/NI_support_Hardware
Hello,
can you please tell a bit more, how do you have anything connected and what, maybe some speakers, have you tried without them connected, just with headphones for example.
Then I guess your device is defective and you have to get a replacement. You could test without the PSU connected, maybe this is the problem then you would need a special USB cable without direct electrical connection.
@Aslak It would be great to try the soundcard on a different computer. If it does the same thing then it's most probably a hardwrae issue and you should contact our hardware service here: https://bit.ly/NI_support_Hardware