I, too, am having the exact same issue. I attempted to move them all to the 5G connection, but it made no difference. They just quit while in the "everywhere" group and will randomly restart, sometimes. It wasn't a problem at first, but the last week has been rediculous. I've eliminated the group and recreated it, but same issue. Each will play indefinitely on their own. Doesn't look like Amazon was much help either.