Hi,
When it says 'Track recently played' it means you have to wait for a certain amount of time before you can request the track again.
(at the moment this is 50 hours)
We do this because otherwise some good songs get played over and over again and other good, yet maybe more unfamiliar songs do not get played at all.
We encourage trying out other songs to request as well. You might find a couple you like!
Greetings,
-Pim