I have an issue with the DM520HD that does not allways work on AAC chs. Specifically we have Optus Sports on Optus C1 @ 156E that will not allways open the audio on some chs, If the audio is music it is fine, but commentry etc and it cuts in and out sometimes working for a couple of minutes then no audio.
I have a DM500HD and DM8000 that has no problem with the audio on these services.