Just combo upgrade from OSX 10.9.3 to 10.9.4. After audio driver built using Multibeast 6.4.2, audio came back fine again even after wake up from sleep. After wake up, I also checked following and they were ok: Access to My Purchase, Airplay and Home Sharing with Apple TV, USB3 external HDD, Hardware monitor. I used only LAN wired connection and hence did not bother the wifi or bluetooth.