Hi @flybyme
Thanks for your post!
Your diagnostic doesn’t indicate any playback errors at all, which means the Beam stopped playing because it was, in some way, told to. There are some Alexa commands from around that time, and commands coming from “Lisa’s” phone, but it could also be that the Beam detected a momentary signal from it’s HDMI input. I presume no-one was telling it to stop, as that wouldn’t be much of a mystery.
As an experiment, please disable Autoplay on the Beam: Settings » System » Sala » disable TV Autoplay. While this setting is off, you can use the Sonos app or the Alexa command “Alexa, switch to TV” to get TV audio playing.
If this prevents the Beam from stopping radio playback by itself, then the cause could be the TV itself, or an HDMI device connected to the TV. Rebooting the TV by unplugging it for at least 2 minutes (and then re-enabling Autoplay) would be a good place to start. Disabling CEC functions on HDMI-connected devices may also help (these usually refer to TV power, volume and input switching), or just disconnect the devices to see if that helps (again with Autoplay back on).
I hope this helps.
Edit: There’s a good amount of Alexa grouping commands around the time playback stopped - please be sure there have been no Alexa commands given in other parts of the house the next time this happens.