So I had the same problem. I would turn the wonder boom on, start the music on my phone and walk away with my phone to sit probably 10 feet away or so. 30-45 seconds later it would turn off. So, I unplugged it from the charger, brought it over to the couch with me and have had no issues. I’m thinking that the blue tooth is being interrupted. I’ve had no problems since as long as I don’t go too far away from the device.