Sonos Voice Control false activations on Beam Ultra since Sonos 27

Hi, since updating to Sonos 27 and setting up my new Beam Ultra, Sonos Voice Control regularly activates the microphones when nobody is saying anything.

Setup: Beam Ultra with two Era 100 as surrounds, connected over HDMI eARC to an LG OLED C5, with an Apple TV 4K (2nd gen) as source. Sonos Voice Control is the only voice assistant. The microphone switch and the voice button are both on.

It happens mostly while watching TV, and it started right after Sonos 27 and the Beam Ultra. Is this a known issue, and is a fix planned?

Thanks!