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I have An Arc Ultra two Era 300 surrounds and a Sub 4. I also have a LG G4 OLED TV, Nvidia Shield, Roku Ultra 2024, and a Oppo UDP-203 Blu-Ray player with an OREI 4K HDMI Audio Extractor for eARC HDA-929.

Problem: Audio from the left or right surround flutters on/off at random from either surround speaker. It does the from the LG G4 TV, the Blu-Ray player, the Roku, and the Nvidia Shield. I tested it on each device with a YouTube 5.1 Surround check video as well as other adios tests there. I checked the Blu-Ray player the Avia Guide to Home Theater DVD. The problem is reproducible on all of these devices. 

The Era 300 Surround speakers are using Wi-Fi, while the Arc Ultra is using Ethernet.

Note that the on/off fluttering occurs at random to either surround speaker.

Have you perhaps disabled the WiFi on the Arc Ultra? If so, you need to leave it enabled as the Era Surrounds and Sub connect directly to the Soundbar over an ad-hoc 5Ghz wireless connection, rather than using the routers WiFi signal. 

Yes, I unplugged the Arc Ultra from the Ethernet and Enabled WIFI. I also locked them all to the same Ubiquity U6 Access point, and that seems to have fixed the issue.

Thanks.

Yes, I unplugged the Arc Ultra from the Ethernet and Enabled WIFI. I also locked them all to the same Ubiquity U6 Access point, and that seems to have fixed the issue.

Thanks.

You can leave the Arc Ultra wired, if you prefer that to using the local 5Ghz band, just don’t disable its WiFi adapters. However if it works on 5Ghz, I’d leave it uncabled, personally speaking.

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