I'm not sure I understand you. Are you saying that, while there still transcoding problems that affect all MPEG-4 receivers, there is one particular receiver type that has audio dropouts caused by its own firmware? If so, pray tell, what model is that?
There is a system wide problem with Dolby in some MPEG-4 encoders. This has been an ongoing problem. First it was the lipsync problems, then the brripps ["fix one"] and now they mute them [fix 2]. This still isn't "fixed", as I see it. Some AVRs don't handle this very well, while other aren't as bad. Fixing the loss of DD5.1 IMO is the real fix.
As to what I'm involved with, I'll leave that for those that have read my posts.
Not everything is in the DVR.
Now to show [I hope] that I don't have rose colored glasses as I look at DirecTV:
From being here and helping others for several years, there is a design flaw in the DVRs with the use of a very crappy power supply. They are so sensitive to voltage changes or noise on the AC lines that this causes all sorts of receiver issues. A customer shouldn't need to buy & use a UPS, under normal use/conditions, to have their receiver work.
They should work with anything from 110 to 126 volts, but don't always.
Turning on a dimmer switch or a florescent light shouldn't cause a 771 error.
"Blank recordings" may not be in the DVR, but in the dish to receiver link, since the receiver may send the tune signal and if the dish doesn't tune, then the DVR records "nothing". Had you been watching this live, you'd see the 771 message, but this doesn't get recorded, so later you have no idea this was the cause.
Yes there are things wrong. Some are in the DVR, some at the SAT/uplink end, and some may simply come down to environment issues like a LCD display interfering with the IR signal.