Just so you know your not crazy, I have seen this problem also when playing with skins. I was using the Joshua03 skins.
I also noted that the LED on front of the box was not blinking when I pressed the button, but after a couple of presses then it blinked and I got a response.
Unfortunately I reflashed (for a different reason) and didn't think too much of it.
The mute coming on was pretty constant for me when navigating.
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