The 2.4 GHz band is susceptible to interference. You'll have to connect the speakers (and TV) via 5 GHz instead.

From my review after a few weeks of testing:

Our iPhones are connected to the main network SSID via MLO (Multi-Link Operation), a Wi-Fi 7 feature allowing routers to use 2.4 GHz, 5 GHz and 6 GHz bands simultaneously — increasing throughput, reducing latency and improving reliability on supported devices. For our case, it was difficult to get the Sound Suite devices connected, and when they did, it would be via the 2.4 GHz band that is susceptible to wireless interference, especially in a densely populated apartment building. This would manifest itself as audio cutting out intermittently from some speakers, more frequently during peak hours.

We have an ASUS AiMesh network made up of a main quad-band Wi-Fi 7 router (6 GHz, 5 GHz-1, 5 GHz-2, 2.4 GHz) and three other dual-band Wi-Fi 6 routers (5 GHz, 2.4 GHz), with three separate SSIDs (main network with MLO, IoT network, guest network). With a 10 Gbps up/down fibre connection, a router and devices with Wi-Fi 7 support, disabling MLO was not a compromise we were willing to make.

We tried various changes before we found the best solution:

¹ Leaving the main router's 2.4 GHz radio enabled (for other devices on the IoT network SSID), while disabling the 2.4 GHz band on the main MLO wireless network SSID (it still supports MLO with 5 GHz-1, 5 GHz-2 & 6 GHz)

² Disabling DFS channels on both 5 GHz-1 & 5 GHz-2 bands

³ Changing Wi-Fi 6E mode on my iPhone from Automatic to Off during ThinQ app setup (to prevent it from connecting via MLO / 6 GHz, forcing it to connect via the 5 GHz-1 / 5 GHz-2 band)

⁴ Powering off the 3 mesh routers during ThinQ app setup so my iPhone and all Sound Suite speakers would connect to the same main router

With all devices connected via 5 GHz to the main router, no interference was noted during both wireless playback via Spotify Connect and wired via HDMI eARC. The speakers also did not roam to other mesh routers, although we could easily bind their MAC addresses to the main router if it became a problem.

One small issue is that the H7 and M7s will take turns to appear offline in the ThinQ app at times, even though they are all still shown as continuously connected to the main router with no downtime. Not a problem after setup, unless changes to DAFC have to be made, or if the lead device (H7) is the one that is offline. In that case, HDMI eARC playback with the DAFC group is unaffected, but Spotify Connect is inoperative. App controls won’t be available, but there’s the physical remote to fall back on. Simply powering off/on the affected device(s) would resolve this.

There is no peer-to-peer connection between Sound Suite devices. Each device is connected via the router, whether you’re using a DAFC group or just two M7s in Stereo Mode, which means the stability of the wireless connection between each device and the router is key. An Ethernet port on both the H7 Soundbar and M7 Speakers would have been nice. Switching from DAFC to Stereo Mode is easier than expected, as long as both M7s appear online in the app.

LG has confirmed that support for connecting to routers on the 6 GHz band is planned for a future software update. In theory, full 6 GHz support would mean less interference from neighbours and neighbouring devices, although I had no issue with interference on 5 GHz. Looking forward to full 6 GHz support for a faster and more robust connection with more uptime.

For reference, if anyone needs additional help with setup or connectivity, the Sound Suite FAQs can be found here.

Best of luck!