I am using Echo Dot 3rd generation devices. I have tried various phrases, none of which work for the stations that aren't working. The two I use the most (using "Calm Yoga Music" as an example, assume this is a station which actually does exist and this is the correct name for it), which work for most stations but mysteriously stop working, apparently at random, for stations are: "Alexa play 'Calm Yoga Music' on Pandora" "Alexa tell Pandora to play the station 'Calm Yoga Music'" What Alexa does when the skill can't find the station actually varies, as in the system non-deterministically responds to the same command with different responses. Some examples are: "Sorry, I don't know that" "Hmmm, I don't know that one" "I can't find the station 'Calm Yoga Music' on Pandora" etc. Looking at the Utterance History report, Alexa is absolutely correctly hearing what I am saying, but the skill isn't finding certain stations, stations that it used to find correctly.
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