So if I'm going through my day and I play music everywhere and maybe decide I don't want music everyone but maybe only in the kitchen, I can tell Alexa to do these things without issue. Maybe I'll swap to another room and then later in the day back to everywhere.
The problem arises when, eventually, Alexa no longer knows what's playing anywhere or thinks nothing is playing despite commands like "Play song from beginning", "skip", "previous" work just fine.
I've seen Alexa so confused that it thinks each device has a different song playing when nothing is playing anywhere or might actually know what is playing but you can't "like" or add it to a playlist because "nothing is streaming". Or, worse, she likes or adds the wrong song.
Unplugging all devices does absolutely nothing.