I have disabled USB power saving (in both the device manager and power management) as suggested in another thread. Playback dropouts like this never happen with my PCI sound cards, so I suspect it might be a USB (or Scarlett) issue. It's distracting and annoying, and makes me question whether the Scarlett can handle what I'd like it to do with Sonar, which is: multi-track audio recording, playback, and MIDI at the same time.
Every few minutes, the sound will cut out for a fraction of a second and then resume. I am currently having dropouts while listening to music. I haven't used it much with Sonar yet, but have been listening to music on it as a test. I recently got a Focusrite Scarlett 2i4 gen2 (USB audio interface). Focusrite Scarlett 2i4 (USB audio interface) - Dropouts, ASIO, and other questions