I start music on my Beam and Play:1 group using Alexa ("Alexa, play Laid Back Classics Station"). After a while I stop it again using Alexa ("Alexa Stop"). Then after several minutes it starts again of its own accord. I then either tell it to stop again using Alexa, or pause it in the Sonos App. But, after several minutes it starts again. It does this repeatedly with about a 5-10 minute gap between me stopping/pausing and it restarting. There is nothing pressing on the controls on the Beam or Play:1's and no noise that it could be misconstruing...and anyway I have said "stop" not Pause when stopping it.
I cannot be sure, but I think this has only started happening since I upgraded to the latest software update (I am now on 10.0), but it has occurred on a few days now. The only way I can then stop it is by switching to TV input (by saying "Alexa turn on the TV")...
I have submitted a diagnostic immediately after it last occurred (that was the 4th resume after stopping it!). My confirmation number for the diagnostic is 2120986725.