Curiouser and curiouser!
All Tidal MQA (Masters) tracks play via my Sooloos regardless of track length.
Tidal FLAC 44/16 tracks play okay up to approximately 7 minutes, track 'Unavailable' between approximately 7 minutes and approximately 10 minutes and then stream correctly again after this!
For what it is worth I've provided examples to Tidal including a graph of the results which show a very clear pattern.
Not saying they can or will do anything about it. I'll let you know.
Cheers.
Bruce
Ps I don't believe that it has anything to do with geographical restrictions.

F80 +