I had a play bar that turned on every night at 2am by itself. It is hooked up to an RCN 4K android cable box optical out. I had to return it . Bought a Yamaha yas-408 sound bar , hooked up identically and never had a problem . Didn’t like the sound quality so I bought an ARC sl hooked it up identically and low and behold it turns on at 2am again. Beyond frustrated.Sonos and I checked for alarms which there are none.
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