Same problem here. At about 1:30 am, my sound just totally died. I rebooted the Voom receiver, didn't help. I rebooted the A/V receiver. Didn't help. I unplugged the Voom receiver for 30 seconds and plugged it back in. Didn't help. Then, I checked to see if I could see the red light that you can see on an optical out when audio is being output. The red light wasn't there. I went to bed, but forgot to mute the A/V receiver since I didn't have any audio. Then, at 9:00 this morning, I awoke to sound from Voom. Then, after work today, I tried to watch HD News, and the sound was there, then it went away, then it back back, then it went away.. off and on, off and on. At the moment, the sound seems constent. I talked to the Voom installation guy who brought my Voom box, and he said that he has also seen this problem at a couple of customers houses, and he thinks it is a problem that was introducted in the 7.37 software.