It seems that since the last update rollup a few days ago. A new problem has surfaced, the audio seems to fade in an out. I am using an independant USB audio device this still is affected.
After switching back to the motherboard audio the problem was eliminated. This suggests a hardware problem with the USB audio device.
Streaming television showed some fading audio so this suggests it is the operating system. The integrated Realtek audio is pretty mature so it is puzzling how the audio can have problems.
Looking around various forums I see that others are also experiencing problems. Many are expecting drivers updates.