Yep, in "Free only" mode it takes at least 1.5hours to scan 105w. I found that out the hard way.
I've also had the "no audio" issue even with a HDMIv 2 18Gbps whatever cable. Once I STOPPED going through my 5-way HDMI switch, and went directly through one of the 3 HDMI ports on my tv directly, I no longer experience the no audio issue.
IF you are having this issue exactly like mine, try this: Jump to another channel, then jump back to the original channel that had no audio. Is it back? If you are making a recording right then and can't zap to another channel, simply go into PVR mode and play the recording for a few seconds. Then STOP, and go back to the live channel and audio will be back. If so, that's exactly how it happened to me. By the way, even with no audio, a recording made at that same time DOES have audio when you listen to it later.
So, IMO, it's some sort of odd HDMI handshaking issue with HDMI switches or receivers.