I followed the instructions by starflyergold and thecaretakerUK to get custom URLs into the new Sonos app. Playback works for a couple of minutes, with occasional short skips, but after about 10 minutes the playback stops intermittently for a half-second or so. I don’t know whether it has to do with buffering, playback speed or the skipping. Did anyone encounter the same problem?
I realized this on my Sonos Roam, and several Sonos-IKEA speakers. The URL I’m using is https://stream.radiofrance.fr/fip/fip.m3u8 - FIP isn’t available on TuneIn.