Harry S

Issue continues to persist for me. Temporarily plugged my Shield directly into my C9 instead of the receiver which avoids the problem.

According to Vincent Teoh we can expect another update for this issue: 

On 7/3/2021 at 10:56 PM, LG C9 said:

I agree with you. The problem is, with ever-changing standards for audio, video, HDMI etc., it’s getting harder and harder to guarantee compatibility between components, especially of different brand names. You’re only an update away from breaking something. And I doubt LG loses much sleep over playing-well with competitors’ gear. 
 

I doubt they do lose much sleep but it's a huge issue in my books. If it isn't fixed promptly I'm definitely going to think twice about trusting them for the next TV if I can't rely on a very common set up working, can't choose to roll back updates on my own tv, and has more adverts in the newer UI. It's not like somebody else changed anything either. This was LG pushing an Advertising based update and breaking a useful feature in the process. The update they've pushed hasn't fixed it and they don't allow me to fix it myself with their own proven to work software..

7 minutes ago, LG C9 said:

Or, maybe it’s time to go with an eArc setup, assuming your gear is compatible.  Worked for me and I’m not going back. Use the TV as your video switcher instead of the receiver. Use the receiver for sound only.  Sorta like the old days!

Perhaps it is but it'd be a shame. It'd take up my last HDMI port to move the Shield to the TV and eventually that'll be a problem when I have 3 120hz 4k devices needing attaching.

Updated from 05.10.14 to 05.10.15 via USB and no improvement. Unwatchable with dolby vision as it goes black once a minute or more, impossible to enjoy a film like this.

Shield Pro 2019 -> Denon x1600h -> LG C9 (OLED55C9PLA)

Tried a Dolby Vision title using Netflix on the LG C9 directly seemingly without issue (didn't test on 5.10.14 so can't tell if that's different).

Really not good enough since they don't let us "down"grade our TVs anymore.