Playback Issues - Audio/Video & Power

Help with audio & video playback issues, TV display type recognition & compatibility, HDCP messages, troubleshooting playback errors, advertisements, and resolving power issues.
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Roku 4660X - Ultra only outputs in PCM 2.0

I recently purchased a Roku Ultra - 4660x. Initially, it worked wonderfully, outputting in DD, DD+, DTS, etc. A few months ago it just stopped and downgraded everything to PCM Stereo. I reset the device. I reset my AV Receiver. Nothing helps. I can stream in all manner of surround formats from my Sony Blu-ray player without a problem to the same receiver, using the same cable. Is this an issue with the firmware? I currently have the following running on my Roku:

Software version: 8.1.0 - build 4145-46

It hasn't been updated since July 27th, despite checking daily. This is a significant disappointment. Is there anything I can do to resolve this, or do I just need to pursue other options? It seems really odd that Roku would stop supporting all these formats. 

Many thanks,
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