A:
Since Roku is streaming, it may be an internet connection issue. I have been streaming music since day one using Bluetooth, and optical connections. I have never experienced a skip such as you describe.
Perhaps try plugging in a different medium of transfer, like an ipod or MP3 player, play a downloaded song, NOT streaming, and see if it persists. If it DOES, then the issue could be more in the Vizio system.